Method for improving call performance of CDMA system

Abstract

The invention discloses a method for improving the call performance of a code division multiple access system, comprising the steps of: configuring the number of retransmissions N of a channel assignment message and the interval time Ti between two adjacent retransmissions of the message in the base station according to the result of the call test , i=1~N; after the base station receives the first call message sent by the terminal, it responds on the paging channel, and then sends the first channel assignment message; the base station keeps the allocated resources and does not release them, and then Time interval Ti retransmits the i-th channel assignment message, if the reverse traffic channel is successfully captured, stop retransmitting and enter the subsequent service negotiation stage. The above N and Ti can be calculated according to the data in the actual test. In the method of the present invention, the base station resends the CAM message multiple times, and within this time, as long as the fast fading of the wireless network environment of the terminal ends, the message can be received and the call process can be continued, thereby reducing call failures and shortening the call duration Effect.

Description

technical field [0001] The invention relates to the field of CDMA cellular communication, in particular to a method for improving the call performance of the CDMA cellular system. Background technique [0002] With the rapid development of cellular networks, users have higher and higher requirements for network service quality. They are not only satisfied with being able to make calls, but also require reducing the number of call failures and shortening the access time. This requires network equipment design. Taking into account the reliability and robustness of the user's use. [0003] In the current CDMA1X system, terminal calls (including voice calls and data calls) follow the protocols "Upper Layer (Layer 3) Signaling Standard for cdma2000 Spread Spectrum Systems" and "3GPP2 Access Network Interfaces Interoperability Specification" issued by the 3GPP2 organization. These protocols provide a framework flow for terminal calls. [0004] figure 1 It is a flow chart of a t...

AI Technical Summary

Problems solved by technology

[0007] When the terminal is on standby in a sector PN1 of base station A, initiates a call or paging response, and starts a call process, base station A sends a response message Base StationAck Order to MS according to the process, if after the terminal initiates a call, PN1 There is a rapid and sharp decline in the pilot strength of PN1, and the strength of PN1 is still not recovered to a good enough level when base station A sends a reply message, then the MS will probably not receive the reply message sent on the forward link

Since the base station A cannot know the situation of the terminal, the base station side continues to implement the procedure and sends the channel assignment message CAM (Channel Assignment Message) on the paging channel. Since the interval between the response message and the channel assignment message is very short, The probability of the terminal losing the CAM is also very high

[0008] After the above process occurs, base station A will enter the state of waiting to capture the prefix of the reverse traffic channel, but the terminal will stay in the state of waiting for the confirmation message, although the terminal will resend the call message after a period of time (ACC_TMO), and the strength of PN1 will also recover It is normal, but according to the description of the protocol flow, base station A will reply a confirmation message at layer 2 to the call message resent by the terminal, but otherwise there is no operation at layer 3 (the CAM message is a layer 3 message)

If this situation continues, there will be a situation where base station A waits for the timer to capture the reverse traffic channel prefix to expire, resulting in a call failure

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