Method for optimizing the random access procedures in the CDMA cellular networks
A random access process and random access technology, applied in code division multiplexing systems, data exchange networks, communication between multiple stations, etc., can solve problems such as detection and resolution, and avoid useless work. and delay, the effect of simplifying channel detection
Inactive Publication Date: 2005-07-06
NOKIA SIEMENS NETWORKS ITAL
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Problems solved by technology
However, other problems besides synchronization and collision arise in the TD-CDMA-TDD case because of its clear access procedure, but they are not fully perceived and solved by the prior invention of the same assignee
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[0075] figure 1 Concisely shows a block diagram of the functional structure of the UMTS mobile radio telephone system (3G) to be described in the present invention. in figure 1 Among them, the mobile phone MS (mobile station or mobile unit) and the car phone, and the portable user equipment unit UE are wirelessly connected to the relevant TRX transceiver (not visible in the figure), which belongs to the territory distributed The associated base transceiver station BTSC (the base transceiver station for CDMA). Each portable user equipment unit UE includes a terminal equipment unit TE (typically a personal computer) connected to a mobile terminal unit (typically a telephone) for transmitting data in a packet format.
[0076]Each TRX is connected to a set of antennas, the configuration of which ensures uniform wireless coverage of the cells served by BTSC, also called Node B. A group of N adjacent cells is called a cluster, which completely occupies all carriers available for mobi...
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The disclosed invention relates to a method for optimizing random access procedures in a third generation CDMA cellular telephone system. Specific embodiments relate to the realization of TD-SCDMA-TDD synchronization. The disclosed procedure consists in that the preliminary part of the responsible network (BSSC, MSC) is only used to establish the following link between the configuration parameters of the physical channels involved: ) to avoid any ambiguity at the mobile station as to where to look for the expected acknowledgment from the network; a random access common channel (P-RACH) is only correlated with a forward access channel (P-FACH) so that Reduce collisions on the latter (P-RACH); one access grant channel (P / S-CCPCH, AGCH) is only associated with one random access common Look for any ambiguity in the answer from the network with a dedicated traffic channel (DPCH) indication; and the full associated link of the physical channel involved in each combination is included in the system information and is responsible for communication with the network (BSSC, When the MSC) exchanges the actual part of the process of the protocol message, it is broadcast to the serving cell, which will be read by the mobile station (MS, UE), and the link immediately sends the service route provided by the network to the mobile station, thus simplifying the access process. Appropriate grouping between downlink pilot sequences, uplink pilot sequences, scrambling codes, basic interposition is performed in a cell-discriminating manner, and broadcast into cells to simplify the service cell selection process.
Description
Technical field [0001] The present invention relates to the field of wireless mobile phones, and more specifically, to a method for optimizing the random access process in a code division multiple access (CDMA) cellular network. [0002] In the technical field of the present invention, many research and development work have been completed all over the world, especially in Europe, to standardize and implement a third-generation (3G) cellular system called UMTS (Universal Mobile Telecommunication System), which is characterized by CDMA (Code Division Multiple Access) Multiple access technology. As we all know, CDMA consists of multiplexing data symbols to be sent at a low symbol rate and a set of pseudo-random noise code sequences (chips) using a higher rate (chip rate) to spread the data from multiple User's information. Spreading code sequences that are orthogonal to each other have negligible cross-correlation and effective auto-correlation to distinguish between multiple users ...
Claims
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IPC IPC(8): H04Q7/38H04B1/707H04B7/26H04J3/00H04L12/56H04W12/10H04W28/04H04W56/00H04W74/08
CPCH04B1/7087H04B7/2668H04J13/004H04W56/00H04W74/002H04W74/08
Inventor 罗塞拉·德贝尼迪蒂斯
Owner NOKIA SIEMENS NETWORKS ITAL