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1. CA2400883 - METHOD FOR OPTIMIZING THE RANDOM ACCESS PROCEDURES IN THE CDMA CELLULAR NETWORKS

Office
Canada
Application Number 2400883
Application Date 22.02.2001
Publication Number 2400883
Publication Date 30.08.2001
Publication Kind A1
IPC
H04W 74/08
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
WWIRELESS COMMUNICATION NETWORKS
74Wireless channel access, e.g. scheduled or random access
08Non-scheduled access, e.g. random access, ALOHA or CSMA
H04W 28/12
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
WWIRELESS COMMUNICATION NETWORKS
28Network traffic or resource management
02Traffic management, e.g. flow control or congestion control
10Flow control
12using signalling between network elements
H04W 56/00
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
WWIRELESS COMMUNICATION NETWORKS
56Synchronisation arrangements
H04B 1/707
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
1Details of transmission systems, not covered by a single one of groups H04B3/-H04B13/123; Details of transmission systems not characterised by the medium used for transmission
69Spread spectrum techniques
707using direct sequence modulation
H04J 3/00
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
JMULTIPLEX COMMUNICATION
3Time-division multiplex systems
CPC
H04B 1/7087
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
1Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
69Spread spectrum techniques
707using direct sequence modulation
7073Synchronisation aspects
7087Carrier synchronisation aspects
H04B 7/2668
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
7Radio transmission systems, i.e. using radiation field
24for communication between two or more posts
26at least one of which is mobile
2662Arrangements for Wireless System Synchronisation
2668Arrangements for Wireless Code-Division Multiple Access [CDMA] System Synchronisation,
H04J 13/004
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
JMULTIPLEX COMMUNICATION
13Code division multiplex systems
0007Code type
004Orthogonal
H04W 56/00
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
WWIRELESS COMMUNICATION NETWORKS
56Synchronisation arrangements
H04W 74/002
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
WWIRELESS COMMUNICATION NETWORKS
74Wireless channel access, e.g. scheduled or random access
002Transmission of channel access control information
H04W 74/08
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
WWIRELESS COMMUNICATION NETWORKS
74Wireless channel access, e.g. scheduled or random access
08Non-scheduled ; or contention based; access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
Applicants SIEMENS INFORMATION AND COMMUNICATION NETWORKS S.P.A.
Priority Data 10008653 24.02.2000 DE
Title
(EN) METHOD FOR OPTIMIZING THE RANDOM ACCESS PROCEDURES IN THE CDMA CELLULAR NETWORKS
(FR) PROCEDE SERVANT A OPTIMISER LES PROCEDURES D'ACCES SELECTIF DANS LES RESEAUX CELLULAIRES AMDC
Abstract
(EN)


The disclosed invention is referred to a method for optimising the random
access procedures in third generation CDMA cellular telephony systems. The
particular embodiment of the example concerns a TD-SCDMA-TDD synchronous
realization. The disclosed procedure includes a preliminary part charged to
the network (BSSC, MSC) only for establishing the following associations
between the configuration parameters of the involved physical channels: one
signature burst (SYNC1) is associated to one forward access channel (P-FACH)
only, in order to avoid any ambiguity in the mobile stations about where to
look for the expected acknowledgement from the network; one random access
common channel (P-RACH) is associated to one forward access channel (P-FACH)
only, in order to reduce collision on the latter (P-RACH); one access grant
channel (P/S-CCPCH, AGCH) only is associated to one random access common
channel (P-RACH), in order to avoid any ambiguity in the mobile stations about
where to look for the expected answer from the network with the indication of
the dedicated service channels (DPCH); and each complete associative link
binding the involved physical channels is included in the system information
and broadcasted into the serving cell to be read by the mobile stations (MS,
UE) when entering an actual part of the procedure charged to exchange protocol
messages with the network (BSSC; MSC) through said associative links that
being signalling at once to the mobile stations the route towards the services
offered by the network, simplifying the access procedure consequently.
Suitable groupings among: Downlink pilot sequences, Uplink pilot sequences,
scrambling codes, basic midambles, are carried out in a cell-discriminating
way and broadcasted into the cell to simplify the serving cell selection
procedure.