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1. (WO2018227442) COMMUNICATION METHODS FOR BROADCAST CHANNEL
Document

Description

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Claims

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Drawings

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Description

Title of Invention : COMMUNICATION METHODS FOR BROADCAST CHANNEL

TECHNICAL FIELD

[0001]
This patent document is directed generally to wireless communications.

BACKGROUND

[0002]
The mobile communication technologies are moving the world toward an increasingly connected and networked society. In comparison with the existing wireless networks, the next generation systems and wireless communication techniques will need to support a much wider range of use-case characteristics and provide a much more complex range of network access techniques.
[0003]
SUMMARY OF PARTICULAR EMBODIMENTS
[0004]
This patent document relates to techniques, systems, and devices for facilitating wireless communication over broadcast channels.
[0005]
In one exemplary aspect, a method for wireless communication is disclosed. The method includes encoding a block of information and an indication of time index, forming a message using the encoded block of information and the encoded indication of time index, and transmitting the message over a broadcast channel. The indication of time index indicates a transmission time of the block of information.
[0006]
In another exemplary aspect, a method for wireless communication is disclosed. The method includes receiving a message over a broadcast channel, identifying an encoded block of information and an encoded indication of time index in the message, decoding the encoded block of information to obtain a block of information, and decoding the encoded indication of time index to obtain an indication of time index. The indication of time index indicates a transmission time of the block of information.
[0007]
In another exemplary aspect, a wireless communication device is disclosed. The device includes a memory to store code, and a processor that is in communication with the memory and operable to execute the code to cause the wireless communication device to encode a block of information and an indication of time index, wherein the indication of time index indicates a transmission time of the block of information; form a message using the encoded block of information and the encoded indication of time index; and transmit the message over a broadcast channel.
[0008]
In yet another exemplary aspect, a wireless communication device is disclosed. The device includes a memory to store code, and a processor that is in communication with the memory and operable to execute the code to cause the wireless communication device to receive a message over a broadcast channel; identify an encoded block of information and an encoded indication of time index in the message; decode the encoded block of information to obtain a block of information; and decode the encoded indication of time index to obtain an indication of time index, wherein the indication of time index indicates a transmission time of the block of information.
[0009]
The above and other aspects and their implementations are described in greater detail in the drawings, the description and the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

[0010]
FIG. 1 shows an example of forming a message using an encoded Master Information Block (MIB) and an encoded Synchronization Signal (SS) Block Time Index.
[0011]
FIG. 2 shows an example of encoding a block of bits including a MIB and a SS Block Time Index.
[0012]
FIG. 3A shows an example of dividing a block of encoded bits into two blocks.
[0013]
FIG. 3B shows an example of transmission of blocks.
[0014]
FIG. 3C shows another example of transmission of blocks.
[0015]
FIG. 4 shows an example of a wireless communication system where techniques in accordance with one or more embodiments of the present technology can be applied.
[0016]
FIG. 5 is a block diagram representation of a portion of a radio station.
[0017]
FIG. 6 is a flowchart representation of a wireless communication method.
[0018]
FIG. 7 is another flowchart representation of a wireless communication method.

DETAILED DESCRIPTION

[0019]
The rapid growth of wireless communications and advances in technology is partly to satisfy the demand for greater capacity and higher data rates. Other aspects, such as energy consumption, device cost, spectrum resource allocation, and latency are also factors in the success of future networks.
[0020]
In wireless communication systems, Master Information Block (MIB) refers to a piece of information that is broadcasted by a base station irrespective of presence of any user devices in the network. The MIB is transmitted using a physical layer channel such as the Physical Broadcast Channel (PBCH) . In Long Term Evolution (LTE) communication systems, the MIB has a generation period of 40 milliseconds -the physical layer receives a new MIB for encoding every 40 milliseconds. The physical layer typically transmits the encoded MIB every 10 milliseconds. As a result, the contents of the encoded MIB within four consecutive transmissions will remain same because MIB changes only after the 40 milliseconds period. A different scrambling code is applied to each of the four consecutive transmissions to include the timing information of the transmission so that a receiving transmission node (e.g., a user entity) can differentiate the transmission time of the MIB. For example, when a user entity (UE) wants to access the network after receiving multiple pieces of encoded MIB over PBCH, it can determine the correct timing information by examining one of the scrambling codes, so long as the encoded MIB and scrambling code are decoded correctly.
[0021]
Overview
[0022]
It has been proposed for the 5G New Radio (5G-NR) access technology that the PBCH can adopt a longer transmission period of 80 milliseconds. The NR-PBCH can transmit the encoded MIB having the same content multiple times (e.g., more than four times) during the 80 ms transmission period ofNR-PBCH. A Synchronous Signal (SS) Block Time Index has also been proposed to carry the relevant timing information.
[0023]
In 5G-NR, the MIB and the SS Block Time Index are transmitted over NR-PBCH. The total length of MIB and error-detecting coding (e.g., cyclic redundancy check) of MIB can be less than 100 bits, and the length of the SS Block Time Index can be shorter than 10 bits. For illustration purpose, the MIB mentioned in this document includes MIB with its error-detecting code.
[0024]
Several types of techniques can be used to indicate the relevant time information for MIB transmission using the SS Block Time Index.
[0025]
Implicit Indication
[0026]
The implicit indication techniques use similar methods as described above for the LTE communication systems. For example, a scrambling code, or an error-detecting code such as a cyclic redundancy check (CRC) code, can be used to indicate the value of the SS Block Time Index. However, such methods may not be desirable for a long SS Block Time Index that includes many bits. For example, when the SS Block Time Index includes K bits, a UE would need to make 2^K guesses before ascertaining the transmission time of the MIB. If the SS Block Time Index includes seven bits, the UE may have to go through 128 possibilities. Therefore, there remains a need for improved techniques to address the inefficiency of implicit indication.
[0027]
Explicit Indication
[0028]
Explicit indication of the SS Block Time Index means an explicit encoding of the SS Block Time Index. For example, a Polar code can be applied to the SS block Time index to encode it separately. Alternatively, the SS Block Time Index can be added to the MIB to form a block of bits, and a Polar code can be applied to the blocked of bits to accomplish the encoding. The explicit indication methods do not require the UE to examine various possibilities embedded in the encoded bits, thereby eliminating the inefficiency introduced by implicit indication methods.
[0029]
In some embodiments, the SS block time index is encoded separately. Various coding schemes can be used for different lengths of the SS block time index:
[0030]
1. Repetition. If the SS block time index has a length of one bit, the one bit can be repeated multiple times to form an encoded SS Block Time Index.
[0031]
2. Simplex. A simplex coding scheme maps a short code to the SS Block Time Index and repeats the short code multiple times to form an encoded SS Block Time Index.
[0032]
3. A separate Polar code or a Reed-Muller code. If the SS Block Time Index has more than three bits, a repetition-based coding scheme (such as repetition or simplex coding scheme) may not be efficient. Alternatively, a Polar code with the same or different length of the SS Time Index can be applied to it to generate an encoded SS Block Time Index.
[0033]
In some embodiments, the SS block Time Index is encoded together with the MIB. Some of the following coding schemes can be used for different lengths of the SS block time index:
[0034]
1. Single Polar code. If the SS block time index is short (e.g., one bit) , it can be concatenated to the end of the MIB to form a new block of bits. A single Polar code can be applied to the entire block of bits.
[0035]
2. Two or more Polar codes. If the SS block time index is long (e.g., more than two bits) , two or more Polar codes can be applied. The Polar codes can have the same length, or different lengths.
[0036]
Combination of Explicit and Implicit Indication
[0037]
In some scenarios, the content of the SS block Time Index is variable while the content of the MIB remains relatively constant. For example, if the SS block time index contains multiple bits, the higher bits of the SS block time index may not vary often while the lower bits of the SS block time index undergo frequency changes. Therefore, the higher bits can be encoded implicitly by being added to the stable MIB, and the lower bits can be encoded explicitly by being coded separately.
[0038]
The above mentioned indication techniques are further explained in the following embodiments.
[0039]
Example embodiment 1
[0040]
In this example, the length of SS Block Time Index is one bit and the length of the encoded SS Block Time Index after coding is 32 bit. It is noted, however, that the length of the encoded SS Block Time Index can vary depending on the amount of available resources.
[0041]
In this particular example, a repetition coding scheme is used. The one bit included in the SS Block Time Index is repeated 32 times to generate the encoded SS Block Time Index. For example, if the SS Block Time Index is binary ‘0’ , the encoded SS Block Time Index is binary ‘0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0’ . If the SS Block Time Index is binary ‘1 ’ , then the encoded SS Block Time Index is binary ‘1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1’ .
[0042]
The MIB can be encoded with a different coding scheme, e.g., applying a Polar code of length N=512. A message can be formed subsequently using the encoded MIB and the encoded SS Block Time Index. The encoded SS Block Time Index can be positioned before or after the encoded MIB to form a block of bits. In some embodiments, the encoded MIB and the encoded SS Block Time Index can be interleaved in the message. For example, FIG. 1 shows an encoded MIB 110 having a subset 101 and a subset 102. FIG. 1 also shows an encoded SS Block Time Index 120 having a subset 103 and a subset 104. As shown in FIG. 1, in the block of bits 130, a first subset of the encoded MIB 101 is followed by a first subset of the encoded SS Block 103. The joined subset is then followed by the second subset of the encoded MIB 102, and the second subset of the encoded SS Block 104. The base station then transmits the block of bits 130 to UEs over the PBCH.
[0043]
After receiving the block of bits, a UE identifies the encoded MIB and the encoded SS Block Time Index in the block of bits. The UE decodes the encoded MIB and the encoded SS Block Time Index separately. If the UE cannot decode the MIB successfully, the UE can store the MIB for later use. The UE can also combine the MIB with an earlier version of MIB having a smaller SS Block Time Index that is not successfully decoded, if such MIB is available. After the combination, UE can attempt to decode the combined MIB. For example, if the current decoded SS Block Time Index is binary “1” and the corresponding MIB cannot be decoded successfully, the UE can combine a previous stored version of the MIB having a SS Block Time Index equal to binary “0” if the previous stored version of the MIB is not successfully decoded.
[0044]
Example embodiment 2
[0045]
In this particular embodiment, the length of SS Block Time Index is 3 bits and the length of encoded SS Block Time Index is 36 bit. It is noted, however, that the same techniques can be applied to SS Block Time Index having different lengths. The length of the encoded SS Block Time Index can also vary depending on the amount of available resources.
[0046]
In this particular embodiment, the SS Block Time Index is encoded with a simplex coding scheme. The simplex coding scheme maps a short code (e.g., 1-4 bits) to the SS Block Time Index and repeats this short code a number of times to generate the encoded SS Block Time Index. For example, the coded SS Block Time Index can be generated according to Table 1. If the SS Block Time Index is binary “011” (3 in decimal) , a short binary code “0, 1” is repeated 18 times to generate the coded SS Block Time Index.
[0047]
The MIB can be encoded with a different coding scheme, e.g., a Polar code of length N=512. A message can be formed subsequently using the encoded MIB and the encoded SS Block Time Index. The encoded SS Block Time Index can be positioned before or after the encoded MIB to form a block of bits. In some embodiments, the encoded MIB and the encoded SS Block Time Index can be interleaved in the message. For example, as shown in FIG. 1, in the block of bits 130, a first subset of the encoded MIB 101 is followed by a first subset of the encoded SS Block 103. The joined subset is then followed by the second subset of the encoded MIB 102, and the second subset of the encoded SS Block 104. The base station then transmits the block of bits 130 to UEs over the PBCH.
[0048]
After receiving the block of bits, a UE identifies the encoded MIB and the encoded SS Block Time Index in the block of bits. The UE decodes the encoded MIB and the encoded SS Block Time Index separately. If the UE cannot decode the MIB successfully, the UE can store the MIB for later use. The UE can also combine the MIB with an earlier version of MIB having a smaller SS Block Time Index that is not successfully decoded, if such MIB is available. After the combination, UE can attempt to decode the combined MIB. For example, if the current decoded SS Block Time Index is binary “011” and the corresponding MIB cannot be decoded successfully, the UE can combine a previous stored version of the MIB having a SS Block Time Index equal to binary “010” if the previous stored version of the MIB is not successfully decoded.
[0049]
Table 1. Encoding scheme for SS Block Time Index
[0050]
[0051]
Example embodiment 3
[0052]
In this example, the length of SS Block Time Index is 7 bits. The lower two bits of the SS Block Time Index undergo frequent changes, while the higher five bits of the SS Block Time Index stay relatively constant. Therefore, the SS Block Time Index can be divided into two subsets: a first subset that includes the higher five bits, and second subset that includes the lower two bits. It is noted the SS Block Time Index can have different lengths, and the division of the SS Block Time Index may also vary in different scenarios. A combination of implicit and explicit indication can be used to encode the first subset and the second subset in different ways.
[0053]
In some embodiments, the lower two bits can be encoded separately into an information block A. The length of the information block A in this particular example is 32 bits. The length of the information block A can also vary depending on the amount of available resources. A simplex coding scheme can be applied to the lower two bits of the SS Block Time Index. For example, the encoded subset of the SS Block Time Index is generated according to Table 2. If the subset of the SS Block Time Index (e.g., the lower two bits) is binary “11” (3 in decimal) , then the encoded subset of the SS Block Time Index (i.e., the information block A) is binary “0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1” .
[0054]
Table 2. Another encoding scheme for SS Block Time Index
[0055]
[0056]
The higher five bits of the SS Block Time Index can be joined with the MIB to form an information block B. For example, the bits can be appended after the MIB, or be positioned before the MIB. A separate coding scheme (e.g., Polar encoding) can be applied to the information block B to generate an information block C representing the encoded MIB and a subset of the encoded SS Block Time Index.
[0057]
A message can be formed by using information block A and the information block C. For example, information block A can be concatenated to the end of the information block C. Information block A can also be placed before the information block C. In some embodiments, the encoded MIB and the encoded SS Block Time Index can be interleaved in the message. The base station then transmits the message to UEs over the PBCH.
[0058]
After receiving the block of bits, a UE identifies the information block C representative of the encoded MIB and a subset of the encoded SS Block Time Index and the information block A representative of the other encoded subset SS Block Time Index. The UE decodes the information block A and the information block C separately. If the UE cannot decode the MIB contained in the information block A successfully, the UE can store the MIB for later use. The UE can also combine the MIB with an earlier version of MIB having a smaller lower two bits in the SS Block Time Index that is not successfully decoded, if such MIB is available. After the combination, UE can attempt to decode the combined MIB. For example, if the current decoded two bits of the SS Block Time Index is binary “11” and the corresponding MIB cannot be decoded successfully, the UE can combine a previous stored version of the MIB having a SS Block Time Index equal to binary “10” if the previous stored version of the MIB is not successfully decoded.
[0059]
Example embodiment 4
[0060]
In this example, the length of SS Block Time Index is 3 bits. The length of the encoded SS Block Time Index is 32 bit. It is noted, however, that the same techniques can be applied to SS Block Time Index having different lengths. The length of the encoded SS Block Time Index can also vary depending on the amount of available resources.
[0061]
In this particular embodiment, the SS Block Time Index is encoded with a Polar code of length N=32 to generate the encoded SS Block Time Index having 32 bits. The MIB can be encoded using a separate coding scheme (e.g., Polar coding) . For example, the MIB is encoded with a Polar code of length N=512.
[0062]
A message can be formed subsequently using the encoded MIB and the encoded SS Block Time Index. The encoded SS Block Time Index can be positioned before or after the encoded MIB to form a block of bits of 544 bits as the message. In some embodiments, the encoded MIB and the encoded SS Block Time Index can be interleaved in the message. The base station then transmits the message to UEs over the PBCH.
[0063]
After receiving the block of bits, a UE identifies the encoded MIB and the encoded SS Block Time Index in the block of bits. The UE decodes the encoded MIB and the encoded SS Block Time Index separately. If the UE cannot decode the MIB successfully, the UE can store the MIB for later use. The UE can also combine the MIB with an earlier version of MIB having a smaller SS Block Time Index that is not successfully decoded, if such MIB is available. After the combination, UE can attempt to decode the combined MIB. For example, if the current decoded SS Block Time Index is binary “011” and the corresponding MIB cannot be decoded successfully, the UE can combine a previous stored version of the MIB having a SS Block Time Index equal to binary “010” if the previous stored version of the MIB is not successfully decoded.
[0064]
Example embodiment 5
[0065]
In this example, the length of SS Block Time Index is 3 bits. The length of the encoded SS Block Time Index is 32 bit. It is noted, however, that the same techniques can be applied to SS Block Time Index having different lengths. The length of the encoded SS Block Time Index can also vary depending on the amount of available resources.
[0066]
In this particular embodiment, the MIB is encoded with a Polar code of length N=512 to generate an encoded MIB with length of N=512 bits. The SS Block Time Index can encoded using the same coding scheme (e.g., the same Polar code of length N=512) . A block of encoded bits with a length of 512 bits is obtained after applying the Polar code. The block of encoded bits can be subsequently shortened (e.g., punctured) to generate the encoded SS Block Time Index having a length of 32 bits.
[0067]
A message can be formed subsequently using the encoded MIB and the encoded SS Block Time Index. The encoded SS Block Time Index can be positioned before or after the encoded MIB to form a block of bits as the message. In some embodiments, the joining of the encoded MIB and the encoded SS Block Time Index can be interleaved in the message. The base station then transmits the message to UEs over the PBCH.
[0068]
After receiving the block of bits, a UE identifies the encoded MIB and the encoded SS Block Time Index in the block of bits. The UE decodes the encoded MIB and the encoded SS Block Time Index separately. If the UE cannot decode the MIB successfully, the UE can store the MIB for later use. The UE can also combine the MIB with an earlier version of MIB having a smaller SS Block Time Index that is not successfully decoded, if such MIB is available. After the combination, UE can attempt to decode the combined MIB. For example, if the current decoded SS Block Time Index is binary “011” and the corresponding MIB cannot be decoded successfully, the UE can combine a previous stored version of the MIB having a SS Block Time Index equal to binary “010” (2 in decimal) if the previous stored version of the MIB is not successfully decoded.
[0069]
Example embodiment 6
[0070]
In this example, the length of SS Block Time Index is K=7 bits. The length of encoded SS Block Time Index is 32 bit. It is noted, however, that the same techniques can be applied to SS Block Time Index having different lengths. The length of the encoded SS Block Time Index can also vary depending on the amount of available resources.
[0071]
In this particular example, the SS Block Time Index is encoded with a Reed-Muller (RM) code of length N=32 (e.g., RM (32, O) ) to obtain the encoded SS Block Time Index including b0, b1, b2, ..., b31. The coding scheme can be expressed as follows:
[0072]
[Math. 0001]


[0073]
In Eq. (1) , i = 0, 1, 2, ..., 31. b i is the generated bits after RM encoding, and K is the length of SS Block Time Index. o n is individual bits of the SS Block Time Index. M i, n is the base sequence of the RM code, as shown in Table 3.
[0074]
The MIB can be encoded with a different coding scheme, e.g., a Polar code of length N=512. A message is formed subsequently using the encoded MIB and the encoded SS Block Time Index. The encoded SS Block Time Index can be positioned before or after the encoded MIB to form a block of bits having a length of 544 bits as the message. In some embodiments, the encoded MIB and the encoded SS Block Time Index can be interleaved in the message. The base station then transmits the message to UEs over the PBCH.
[0075]
After receiving the block of bits, a UE decodes the encoded MIB and the encoded SS Block Time Index separately. If the UE cannot decode the MIB successfully, the UE can store the MIB for later use. The UE can also combine the MIB with an earlier version of MIB having a smaller SS Block Time Index that is not successfully decoded, if such MIB is available. After the combination, UE can attempt to decode the combined MIB. For example, ifthe current decoded SS Block Time Index is binary “0000011” and the corresponding MIB cannot be decoded successfully, the UE can combine a previous stored version of the MIB having a SS Block Time Index equal to binary “0000010” if the previous stored version of the MIB is not successfully decoded.
[0076]
Table 3. The base sequence for RM code
[0077]
[Table 0001]
i Mi, 0 Mi, 1 Mi, 2 Mi, 3 Mi, 4 Mi, 5 Mi, 6 Mi, 7 Mi, 8 Mi, 9 Mi, 10
0 1 1 0 0 0 0 0 0 0 0 1
1 1 1 1 0 0 0 0 0 0 1 1
2 1 0 0 1 0 0 1 0 1 1 1
3 1 0 1 1 0 0 0 0 1 0 1
4 1 1 1 1 0 0 0 1 0 0 1
5 1 1 0 0 1 0 1 1 1 0 1
6 1 0 1 0 1 0 1 0 1 1 1
7 1 0 0 1 1 0 0 1 1 0 1
8 1 1 0 1 1 0 0 1 0 1 1
9 1 0 1 1 1 0 1 0 0 1 1
10 1 0 1 0 0 1 1 1 0 1 1
11 1 1 1 0 0 1 1 0 1 0 1
12 1 0 0 1 0 1 0 1 1 1 1
13 1 1 0 1 0 1 0 1 0 1 1
14 1 0 0 0 1 1 0 1 0 0 1
15 1 1 0 0 1 1 1 1 0 1 1
16 1 1 1 0 1 1 1 0 0 1 0
17 1 0 0 1 1 1 0 0 1 0 0
18 1 1 0 1 1 1 1 1 0 0 0
19 1 0 0 0 0 1 1 0 0 0 0
20 1 0 1 0 0 0 1 0 0 0 1
21 1 1 0 1 0 0 0 0 0 1 1
22 1 0 0 0 1 0 0 1 1 0 1
23 1 1 1 0 1 0 0 0 1 1 1
24 1 1 1 1 1 0 1 1 1 1 0
25 1 1 0 0 0 1 1 1 0 0 1
26 1 0 1 1 0 1 0 0 1 1 0
27 1 1 1 1 0 1 0 1 1 1 0
28 1 0 1 0 1 1 1 0 1 0 0
29 1 0 1 1 1 1 1 1 1 0 0
30 1 1 1 1 1 1 1 1 1 1 1
31 1 0 0 0 0 0 0 0 0 0 0

[0078]
Example embodiment 7
[0079]
In this example, the length of SS Block Time Index is one bit. It is noted that the length of SS Block Time Index may also be another small value.
[0080]
Because the SS Block Time Index is short, it can be added to the MIB before being encoded. For example, as shown in FIG. 2, the one bit of the SS Block Time Index u511 is concatenated to the end of the MIB to form a block of bits {u0, u1, ..., u511} . The block of bits is then encoded using a coding scheme (e.g., Polar encoding) . For example, a Polar code with a length of N=512 is used, and an encoded block of bits {x0, x1, ..., x511} having a length of N=512 is obtained after the Polar encoding.
[0081]
As shown in FIG. 2, the one bit SS Block Time Index is placed as the last bit u511 in the block of bits. After the Polar encoding, the encoded bit remains as the last bit x511 in the encoded block of bits. Its relative position in the block of its does not change, so that the receiving UE can easily identify which bit (s) represent the encoded SS Block Time Index. The base station then transmits the block of bits {x0, x1, ..., x511} to UEs over the PBCH. In some embodiments, the value of the encoded bit equals to the value of the original bit: x511 = u511.
[0082]
After receiving the block of bits, a UE identifies the information block C representative of the encoded MIB and a subset of the encoded SS Block Time Index and the information block A representative of the other encoded subset SS Block Time Index. The UE decodes the encoded MIB and the encoded SS Block Time Index separately. Ifthe UE cannot decode the MIB successfully, the UE can store the MIB for later use. The UE can also combine the MIB with an earlier version of MIB having a smaller SS Block Time Index that is not successfully decoded, if such MIB is available. After the combination, UE can attempt to decode the combined MIB. For example, if the current decoded SS Block Time Index is binary “1” and the corresponding MIB cannot be decoded successfully, the UE can combine a previous stored version of the MIB having a SS Block Time Index equal to binary “0” if the previous stored version of the MIB is not successfully decoded.
[0083]
Example embodiment 8
[0084]
In this example, the length of SS Block Time Index is two bits. It can be divided into a first subset having one bit and a second subset having one bit. It is noted that the same techniques can also be apply to the SS Block Time Index having a different length.
[0085]
The MIB and the first subset of SS Block Time Index (i.e., the first bit) can be encoded using a coding scheme, such as Polar coding. A Polar code with a length of N=512 can be used to obtain a first block A of encoded bits having a length of N=512. The first subset of SS Block Time Index can be concatenated to the end of the MIB, such as shown in FIG. 2. As discussed above, after the Polar encoding, the encoded bit remains as the last bit in the encoded block of bits. Its relative position in the block of its does not change, so that the receiving UE can easily identify which bit (s) represent the encoded SS Block Time Index. In some embodiments, the value of the encoded bit equals to the value of original bit: x511 = u511.
[0086]
Similarly, the MIB and the second subset of SS Block Time Index can be encoded using a coding scheme, such as Polar coding. A Polar code with a length of N=512 can be used to obtain a second block B of encoded bits having a length of N=512. In some implementations, the same Polar code used for the MIB and the first subset of SS Block Time Index is reused. The second subset of SS Block Time Index can be concatenated to the end of the MIB, such as shown in FIG. 2. Similarly, after the Polar encoding, the encoded bit remains as the last bit in the encoded block of bits. Its relative position in the block of its does not change, so that the receiving UE can easily identify which bit (s) represent the encoded SS Block Time Index. In some embodiments, the value of the encoded bit equals to the value of original bit: x511 = u511.
[0087]
A block C of 1024 bits can be formed using the first block A of encoded bits and the second block B of encoded bits. The base station then transmits the block of 1024 bits to UEs over the PBCH.
[0088]
The redundancy of the encoded MIB allows more accurate decoding on the UE side. After receiving the block of bits, a UE identifies the information block C representative of the encoded MIB and a subset of the encoded SS Block Time Index and the information block A representative of the other encoded subset SS Block Time Index. The UE decodes the first 512 bits including the encoded MIB and the encoded first subset of the SS Block Time Index. The UE then decodes the second 512 bits including the encoded MIB and the encoded second subset of the SS Block Time Index. The redundancy of the MIB allows more accurate decoding of the MIB without referring to previously stored MIB.
[0089]
However, if the UE still cannot decode the MIB successfully, the UE can store the MIB for later use. The UE can also combine the MIB with an earlier version of MIB having a smaller SS Block Time Index that is not successfully decoded, if such MIB is available. After the combination, UE can attempt to decode the combined MIB. For example, ifthe current decoded SS Block Time Index is binary “01” and the corresponding MIB cannot be decoded successfully, the UE can combine a previous stored version of the MIB having a SS Block Time Index equal to binary “00” if the previous stored version of the MIB is not successfully decoded.
[0090]
Example embodiment 9
[0091]
In this example, the length of SS Block Time Index is two bits. It can be divided into a first subset having one higher bit and a second subset having one lower bit. It is noted that the same techniques can also be apply to the SS Block Time Index having a different length.
[0092]
The MIB and the first subset of SS Block Time Index (i.e., the higher bit) can be encoded using a coding scheme, such as Polar coding. A Polar code with a length of N=512 can be used to obtain a block A of encoded bits having a length of N=512. The first subset of SS Block Time Index can be concatenated to the end of the MIB, such as shown in FIG. 2. As discussed above, after the Polar encoding, the encoded bit remains as the last bit in the encoded block of bits. Its relative position in the block of its does not change, so that the receiving UE can easily identify which bit (s) represent the encoded SS Block Time Index. In some embodiments, the value of the encoded bit equals to the value of original bit: x511 = u511.
[0093]
The block A of encoded bits is then divided into two blocks B and C having the same length. As shown in FIG. 3A, block A 300 is divided into two parts: block B 301 has a length of 256 bits, and block C 302 has a length of 256 bits.
[0094]
The base station then transmits either block B or block C based on the value of the second subset of SS Block Time Index (i.e., the lower bit) . For example, when the lower bit is 0, the base station transmits block B. When the lower bit is 1, the base station transmit block C.
[0095]
In some embodiments, the base station transmits multiple copies of the blocks to create extra redundancy in order to facilitate the decoding of the data bits. For example, as shown in FIG. 3B, when the lower bit is 0, the base station transmits two copies of block B (512 bits in total) . When the lower bit is 1, the base station transmits two copies of block C (512 bits in total) .
[0096]
In some embodiments, the base station transmits different copies of block B or block C based on the value of the second subset of SS Block Time Index (i.e., the lower bit) . Block B and block C can be combined in different orders. For example, as shown in FIG. 3C, when the lower bit is 0, the base station transmits block B and block C (512 bits in total) . When the lower bit is 1, the base station transmits block C and block B (512 bits in total) .
[0097]
In some implementations, the base station can apply two different scrambling codes to generate two different blocks of information based on block A. The base station then transmit a different copy based on the value of the second subset of SS Block Time Index (i.e., the lower bit) . For example, when the lower bit is 0, a first scrambling code is applied to block A to generate A1, and A1 is transmitted. When the lower bit is 1, a second scrambling code is applied to A to generate A2, and A2 is transmitted.
[0098]
After receiving the block of bits, a UE identifies the encoded MIB and the encoded subset of SS Block Time Index in the block of bits. The UE decodes the encoded MIB and the encoded subset SS Block Time Index separately. Ifthe UE cannot decode the MIB successfully, the UE can store the MIB for later use. The UE can also combine the MIB with an earlier version of MIB having a smaller SS Block Time Index that is not successfully decoded, if such MIB is available. After the combination, UE can attempt to decode the combined MIB.
[0099]
FIG. 4 shows an example of a wireless communication system where techniques in accordance with one or more embodiments of the present technology can be applied. A wireless communication system 400 can include one or more base stations (BSs) 405a, 405b, one or more wireless devices 410a, 410b, 410c, 410d, and an access network 425. A base station 405a, 405b can provide wireless service to wireless devices 410a, 410b, 410c and 410d in one or more wireless sectors. In some implementations, a base station 405a, 405b includes directional antennas to produce two or more directional beams to provide wireless coverage in different sectors.
[0100]
The access network 425 can communicate with one or more base stations 405a, 405b. In some implementations, the access network 425 includes one or more base stations 405a, 405b. In some implementations, the access network 425 is in communication with a core network (not shown in FIG. 4) that provides connectivity with other wireless communication systems and wired communication systems. The core network may include one or more service subscription databases to store information related to the subscribed wireless devices 410a, 410b, 410c and 410d. A first base station 405a can provide wireless service based on a first radio access technology, whereas a second base station 405b can provide wireless service based on a second radio access technology. The base stations 405a and 405b may be co-located or may be separately installed in the field according to the deployment scenario. The access network 425 can support multiple different radio access technologies.
[0101]
In some implementations, a wireless communication system can include multiple networks using different wireless technologies. A dual-mode or multi-mode wireless device includes two or more wireless technologies that could be used to connect to different wireless networks.
[0102]
FIG. 5 is a block diagram representation of a portion of a radio station. A radio station 505 such as a base station or a wireless device (or UE) can include processor electronics 510 such as a microprocessor that implements one or more of the wireless techniques presented in this document. The radio station 505 can include transceiver electronics 515 to send and/or receive wireless signals over one or more communication interfaces such as antenna 520. The radio station 505 can include other communication interfaces for transmitting and receiving data. Radio station 505 can include one or more memories (not explicitly shown) configured to store information such as data and/or instructions. In some implementations, the processor electronics 510 can include at least a portion of the transceiver electronics 515. In some embodiments, at least some of the disclosed techniques, modules or functions are implemented using the radio station 505.
[0103]
FIG. 6 is a flowchart representation of a wireless communication method 600. The method 600 includes, at 602, encoding a block of information and an indication of time index, wherein the indication of time index indicates a transmission time of the block of information; at 604, forming a message using the encoded block of information and the encoded indication of time index; and, at 606, transmitting the message over a broadcast channel.
[0104]
In some embodiments, the encoding of the block of information and the indication of time index includes applying a first coding scheme to the block of information to generate the encoded block of information, and applying a second coding scheme to the indication of time index to generate the encoded indication of time index. The second coding scheme can a simplex coding scheme. The simplex coding scheme may comprise mapping a code to the indication of time index and repeating the code multiple times to form the encoded indication of time index.
[0105]
In some embodiments, the first coding scheme uses a first Polar code and the second coding scheme uses a second Polar code. The first Polar code can have a length longer than that of the second Polar code. The first Polar code may also be the same as the second Polar code. The method further includes reducing a length of the encoded indication of time index. The reduced length is shorter than a length of the second Polar code. In some implementations, the second coding scheme uses a Reed-Muller code.
[0106]
In some embodiments, the encoding of the block of information and the indication of time index includes applying a first coding scheme to the block of information and a subset of the indication of time index to generate an encoded block of bits including the encoded block of information, and applying a second coding scheme to a remaining of the indication of time index to generate the encoded indication of time index. The forming of the message includes concatenating the encoded block of bits and the encoded indication of time index. The second coding scheme is a simplex coding scheme comprising mapping a code to the indication of time index and repeating the code multiple times to form the encoded indication of time index.
[0107]
In some embodiments, the encoding of the block of information and the indication of time index includes forming a block of bits using the block of information and the indication of time index, wherein the indication of time index is positioned at a first position in the block of bits and applying a coding scheme to the block of bits to generate an encoded block of bits including the encoded block of information and the encoded indication of time index. The encoded indication of time index is positioned at a second position in the encoded block of bits, the second position corresponding to the first position in the block of bits.
[0108]
In some embodiments, the encoding of the block of information and the indication of time index includes applying a coding scheme to a first block of bits formed by the block of information and a subset of the indication of time index, and applying the code scheme to a second block of bits formed by the block of information and remaining of the indication of time index. The subset of the indication of time index is positioned after the block of information in the first block of bits and the remaining of the indication of time index is positioned after the block of information in the second block of bits. The forming of the message includes concatenating the first block of bits and the second block of bits in the message.
[0109]
In some embodiments, the encoding of the block of information and the indication of time index includes forming a block of bits by concatenating the block of information and a subset of the indication of time index, wherein the indication of time index is positioned at a first position in the block of bits, and applying a coding scheme to the block of bits to generate an encoded block of bits including the encoded block of information and the encoded indication of time index, wherein the encoded indication of time index is positioned at a second position in the encoded block of bits that corresponds to the first position in the block of bits. The forming of the message includes dividing the block of bits into a plurality of parts, and selecting a subset of the plurality of parts to the message based on remaining of the indication of time index.
[0110]
FIG. 7 is another flowchart representation of a wireless communication method 700. The method 700 includes, at 702, receiving a message over a broadcast channel; at 704, identifying an encoded block of information and an encoded indication of time index in the message; at 706, decoding the encoded block of information to obtain a block of information; and, at 708, decoding the encoded indication of time index to obtain an indication of time index, wherein the indication of time index indicates a transmission time of the block of information.
[0111]
In some embodiments, the decoding of the encoded block of information includes decoding a first Polar code and the decoding of the encoded indication of time index includes decoding a second Polar code. The first Polar code can have a length longer than the second Polar code. The first Polar code may also be the same as the second Polar code.
[0112]
In some embodiments, the decoding of the encoded indication of time index includes using a simplex decoding scheme. The simplex decoding scheme maps the indication of time index to a code and the code is repeated multiple times in the encoded indication of time index.
[0113]
In some embodiments, the decoding of the encoded indication of time index includes using a Reed-Muller code.
[0114]
In some embodiments, the method further includes combining the block of information with information obtained in other messages having transmission time prior to the transmission time indicated in the message.
[0115]
It will be appreciated that techniques for using broadcast channels for transmitting control data are disclosed. The techniques allow explicit encoding of at least a subset of the SS Block Time Index so that the receiving communication code can obtain relevant transmission time of the MIB more efficiently.
[0116]
Some of the embodiments described herein are described in the general context of methods or processes, which may be implemented in one embodiment by a computer program product, embodied in a computer-readable medium, including computer-executable instructions, such as program code, executed by computers in networked environments. A computer-readable medium may include removable and non-removable storage devices including, but not limited to, Read Only Memory (ROM) , Random Access Memory (RAM) , compact discs (CDs) , digital versatile discs (DVD) , etc. Therefore, the computer-readable media can include a non-transitory storage media. Generally, program modules may include routines, programs, objects, components, data structures, etc., that perform particular tasks or implement particular abstract data types. Computer-or processor-executable instructions, associated data structures, and program modules represent examples of program code for executing steps of the methods disclosed herein. The particular sequence of such executable instructions or associated data structures represents examples of corresponding acts for implementing the functions described in such steps or processes.
[0117]
Some of the disclosed embodiments can be implemented as devices or modules using hardware circuits, software, or combinations thereof. For example, a hardware circuit implementation can include discrete analog and/or digital components that are, for example, integrated as part of a printed circuit board. Alternatively, or additionally, the disclosed components or modules can be implemented as an Application Specific Integrated Circuit (ASIC) and/or as a Field Programmable Gate Array (FPGA) device. Some implementations may additionally or alternatively include a digital signal processor (DSP) that is a specialized microprocessor with an architecture optimized for the operational needs of digital signal processing associated with the disclosed functionalities of this application. Similarly, the various components or sub-components within each module may be implemented in software, hardware or firmware. The connectivity between the modules and/or components within the modules may be provided using any one of the connectivity methods and media that is known in the art, including, but not limited to, communications over the Internet, wired, or wireless networks using the appropriate protocols.
[0118]
While this patent document contains many specifics, these should not be construed as limitations on the scope of any invention or of what may be claimed, but rather as descriptions of features that may be specific to particular embodiments of particular inventions. Certain features that are described in this patent document in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable sub-combination. Moreover, although features may be described above as acting in certain combinations and even initially claimed as such, one or more features from a claimed combination can in some cases be excised from the combination, and the claimed combination may be directed to a sub-combination or variation of a sub-combination.
[0119]
Similarly, while operations are depicted in the drawings in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. Moreover, the separation of various system components in the embodiments described in this patent document should not be understood as requiring such separation in all embodiments.
[0120]
Only a few implementations and examples are described and other implementations, enhancements and variations can be made based on what is described and illustrated in this patent document.

Claims

[Claim 1]
A method for wireless communication, comprising: encoding a block of information and an indication of time index, wherein the indication of time index indicates a transmission time of the block of information; forming a message using the encoded block of information and the encoded indication of time index; and transmitting the message over a broadcast channel.
[Claim 2]
The method of claim 1, wherein the encoding of the block of information and the indication of time index includes: applying a first coding scheme to the block of information to generate the encoded block of information, and applying a second coding scheme to the indication of time index to generate the encoded indication of time index.
[Claim 3]
The method of claim 2, wherein the second coding scheme is a simplex coding scheme.
[Claim 4]
The method of claim 3, wherein the simplex coding scheme comprises mapping a code to the indication of time index and repeating the code multiple times to form the encoded indication of time index.
[Claim 5]
The method of claim 2, wherein the first coding scheme uses a first Polar code and the second coding scheme uses a second Polar code.
[Claim 6]
The method of claim 5, wherein the first Polar code has a length longer than that of the second Polar code.
[Claim 7]
The method of claim 5, wherein the first Polar code is the same as the second Polar code.
[Claim 8]
The method of claim 7, further includes reducing a length of the encoded indication of time index, wherein the reduced length is shorter than a length of the second Polar code.
[Claim 9]
The method of claim 2, wherein the second coding scheme uses a Reed-Muller code.
[Claim 10]
The method of claim 1, wherein the encoding of the block of information and the indication of time index includes: applying a first coding scheme to the block of information and a subset of the indication of time index to generate an encoded block of bits including the encoded block of information, and applying a second coding scheme to a remaining of the indication of time index to generate the encoded indication of time index.
[Claim 11]
The method of claim 10, wherein the forming of the message includes: concatenating the encoded block of bits and the encoded indication of time index.
[Claim 12]
The method of claim 10, wherein the second coding scheme is a simplex coding scheme comprising mapping a code to the indication of time index and repeating the code multiple times to form the encoded indication of time index.
[Claim 13]
The method of claim 1, wherein the encoding of the block of information and the indication of time index includes: forming a block of bits using the block of information and the indication of time index, wherein the indication of time index is positioned at a first position in the block of bits; and applying a coding scheme to the block of bits to generate an encoded block of bits including the encoded block of information and the encoded indication of time index.
[Claim 14]
The method of claim 13, wherein the encoded indication of time index is positioned at a second position in the encoded block of bits, the second position corresponding to the first position in the block of bits.
[Claim 15]
The method of claim 1, wherein the encoding of the block of information and the indication of time index includes: applying a coding scheme to a first block of bits formed by the block of information and a subset of the indication of time index, and applying the code scheme to a second block of bits formed by the block of information and remaining of the indication of time index.
[Claim 16]
The method of claim 15, wherein the subset of the indication of time index is positioned after the block of information in the first block of bits and the remaining of the indication of time index is positioned after the block of information in the second block of bits.
[Claim 17]
The method of claim 16, wherein the forming of the message includes: concatenating the first block of bits and the second block of bits in the message.
[Claim 18]
The method of claim 1, wherein the encoding of the block of information and the indication of time index includes: forming a block of bits by concatenating the block of information and a subset of the indication of time index, wherein the indication of time index is positioned at a first position in the block of bits, and applying a coding scheme to the block of bits to generate an encoded block of bits including the encoded block of information and the encoded indication of time index, wherein the encoded indication of time index is positioned at a second position in the encoded block of bits that corresponds to the first position in the block of bits.
[Claim 19]
The method of claim 18, wherein the forming of the message includes: dividing the block of bits into a plurality of parts, and selecting a subset of the plurality of parts to the message based on remaining of the indication of time index.
[Claim 20]
A method for wireless communication, comprising: receiving a message over a broadcast channel; identifying an encoded block of information and an encoded indication of time index in the message; decoding the encoded block of information to obtain a block of information; and decoding the encoded indication of time index to obtain an indication of time index, wherein the indication of time index indicates a transmission time of the block of information.
[Claim 21]
The method of claim 20, wherein the decoding of the encoded block of information includes decoding a first Polar code and the decoding of the encoded indication of time index includes decoding a second Polar code.
[Claim 22]
The method of claim 21, wherein the first Polar code has a length longer than the second Polar code.
[Claim 23]
The method of claim 21, wherein the first Polar code is the same as the second Polar code.
[Claim 24]
The method of claim 20, wherein the decoding of the encoded indication of time index includes using a simplex decoding scheme.
[Claim 25]
The method of claim 24, wherein the simplex decoding scheme maps the indication of time index to a code and the code is repeated multiple times in the encoded indication of time index.
[Claim 26]
The method of claim 20, wherein the decoding of the encoded indication of time index includes using a Reed-Muller code.
[Claim 27]
The method of claim 20, further comprising: combining the block of information with information obtained in other messages having transmission time prior to the transmission time indicated in the message.
[Claim 28]
A wireless communication device, comprising: a processor operable to execute code to: encode a block of information and an indication of time index, wherein the indication of time index indicates a transmission time of the block of information, and form a message using the encoded block of information and the encoded indication of time index; and a transceiver in communication with the processor to transmit the message over a broadcast channel.
[Claim 29]
The device of claim 28, wherein the processor is operable to encode the block of information and an indication of time index by: applying a first coding scheme to the block of information to generate the encoded block of information, and applying a second coding scheme to the indication of time index to generate the encoded indication of time index.
[Claim 30]
The device of claim 29, wherein the second coding scheme is a simplex coding scheme.
[Claim 31]
The device of claim 30, wherein the simplex coding scheme comprises mapping a code to the indication of time index and repeating the code multiple times to form the encoded indication of time index.
[Claim 32]
The device of claim 28, wherein the first coding scheme uses a first Polar code and the second coding scheme uses a second Polar code.
[Claim 33]
The device of claim 32, wherein the first Polar code has a length longer than that of the second Polar code.
[Claim 34]
The device of claim 32, wherein the first Polar code is the same as the second Polar code.
[Claim 35]
The device of claim 34, wherein the processor is operable to reduce a length of the encoded indication of time index, the reduced length shorter than a length of the second Polar code.
[Claim 36]
The device of claim 29, wherein the second coding scheme uses a Reed-Muller code.
[Claim 37]
The device of claim 28, wherein the processor is operable to encode the block of information and the indication of time index by: applying a first coding scheme to the block of information and a subset of the indication of time index to generate an encoded block of bits including the encoded block of information, and applying a second coding scheme to a remaining of the indication of time index to generate the encoded indication of time index.
[Claim 38]
The device of claim 37, wherein the processor is operable to form the message by: concatenating the encoded block of bits and the encoded indication of time index.
[Claim 39]
The device of claim 37, wherein the second coding scheme is a simplex coding scheme comprising mapping a code to the indication of time index and repeating the code multiple times to form the encoded indication of time index.
[Claim 40]
The device of claim 28, wherein the processor is operable to encode the block of information and the indication of time index by: forming a block of bits by joining the block of information and the indication of time index, wherein the indication of time index is positioned at a first position in the block of bits; and applying a coding scheme to the block of bits to generate an encoded block of bits including the encoded block of information and the encoded indication of time index.
[Claim 41]
The device of claim 40, wherein the encoded indication of time index is positioned at a second position in the encoded block of bits, the second position corresponding to the first position in the block of bits.
[Claim 42]
The device of claim 28, wherein the processor is operable to encode the block of information and the indication of time index by: applying a coding scheme to a first block of bits formed by the block of information and a subset of the indication of time index, and applying the code scheme to a second block of bits formed by the block of information and remaining of the indication of time index.
[Claim 43]
The device of claim 42, wherein the subset of the indication of time index is positioned after the block of information in the first block of bits and the remaining of the indication of time index is positioned after the block of information in the second block of bits.
[Claim 44]
The device of claim 43, wherein the processor is operable to form the message by: concatenating the first block of bits and the second block of bits in the message.
[Claim 45]
The device of claim 28, wherein the processor is operable to encode the block of information and the indication of time index by: forming a block of bits by concatenating the block of information and a subset of the indication of time index, wherein the indication of time index is positioned at a first position in the block of bits, and applying a coding scheme to the block of bits to generate an encoded block of bits including the encoded block of information and the encoded indication of time index, wherein the encoded indication of time index is positioned at a second position in the encoded block of bits that corresponds to the first position in the block of bits.
[Claim 46]
The device of claim 45, wherein the processor is operable to form the message by: dividing the block of bits into a plurality of parts, and selecting a subset of the plurality of parts to the message based on remaining of the indication of time index.
[Claim 47]
A wireless communication device, comprising: a transceiver configured to receive a message over a broadcast channel; and a processor in communication with the transceiver, operable to execute code to: identify an encoded block of information and an encoded indication of time index in the message; decode the encoded block of information to obtain a block of information; and decode the encoded indication of time index to obtain an indication of time index, wherein the indication of time index indicates a transmission time of the block of information.
[Claim 48]
The device of claim 47, wherein the processor is operable to decode the encoded block of information by decoding a first Polar code and the processor is operable to decode the encoded indication of time index by decoding a second Polar code.
[Claim 49]
The device of claim 48, wherein the first Polar code has a length longer than the second Polar code.
[Claim 50]
The device of claim 48, wherein the first Polar code is the same as the second Polar code.
[Claim 51]
The device of claim 47, wherein the processor is operable to decode the encoded indication of time index by using a simplex decoding scheme.
[Claim 52]
The device of claim 51, wherein the simplex decoding scheme maps the indication of time index to a code and the code is repeated multiple times in the encoded indication of time index.
[Claim 53]
The device of claim 47, wherein the processor is operable to decode the encoded indication of time index using a Reed-Muller code.
[Claim 54]
The device of claim 47, wherein the processor is operable to combine the block of information with information obtained in other messages having transmission time prior to the transmission time indicated in the message.

Drawings

[ Fig. 0001]  
[ Fig. 0002]  
[ Fig. 0003]  
[ Fig. 0004]  
[ Fig. 0005]  
[ Fig. 0006]  
[ Fig. 0007]  
[ Fig. 0008]  
[ Fig. 0009]