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Keeping method of uplink synchronization for time division synchronous code division multi-address accessing system

A technology of code division multiple access and time division synchronization, applied in the direction of synchronization devices, electrical components, wireless communication, etc., can solve the problems of unscheduled HSUPA resource allocation uncertainty, uncertainty, synchronization maintenance uncertainty, etc.

Inactive Publication Date: 2013-06-05
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the uncertainty of the scheduling allocation method itself, it leads to the uncertainty of SS command generation and bearer channel transmission, which leads to the uncertainty of uplink synchronization maintenance
The allocation of non-scheduled HSUPA resources is also uncertain
In the above scenario, there may be a problem that synchronization remains uncertain

Method used

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  • Keeping method of uplink synchronization for time division synchronous code division multi-address accessing system
  • Keeping method of uplink synchronization for time division synchronous code division multi-address accessing system
  • Keeping method of uplink synchronization for time division synchronous code division multi-address accessing system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] In this embodiment, as Figure 5 As shown, the use of HSDPA-related channel resources to maintain uplink synchronization includes the following steps:

[0050] Step 501: Node B schedules UE;

[0051] Step 502: Node B starts a timer when the scheduling of the UE stops;

[0052] Step 503: Determine whether the UE is scheduled again within a preset time period, if yes, reset the timer and return to step 501, otherwise, continue to execute;

[0053] Step 504: Node B schedules and transmits the HS-SCCH channel, sends the SS command to the UE through the channel, resets the timer and starts timing;

[0054] When Node B schedules and transmits HS-SCCH channels, the following scheduling methods can be used to configure HS-PDSCH resource allocation information as needed:

[0055] Method 1: Node B schedules and allocates HS-PDSCH resources to UE;

[0056] As with normal scheduling, Node B allocates HS-PDSCH resources to UEs by configuring time slot resource indicator bits and start code and...

Embodiment 2

[0066] When using HSUPA-related channel resources for uplink synchronization maintenance, similar to the synchronization maintenance method of HSDPA scheduling described above, Node B judges that the UE is not scheduled within a predetermined time, then schedules and transmits the E-AGCH channel, and allocates E through the channel -PUCH channel resource allocation information and send SS command to UE; UE receives SS command from E-AGCH channel, adjusts uplink synchronization timing according to the command, and transmits E-PUCH according to new uplink synchronization timing and E-PUCH channel resource allocation information Channel, complete the uplink synchronization maintenance.

[0067] The method for judging whether to schedule and transmit the E-AGCH channel is the same as the HS-SCCH channel in embodiment 1, but different from the HS-SCCH channel, the Node B needs to allocate E-PUCH for the UE when periodically transmitting the E-AGCH channel Channel resources and sent to...

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Abstract

The invention discloses an uplink synchronization maintaining method of a time division synchronous code division multiple access system, which ensures that the uplink synchronization can be still maintained in the condition that a terminal is allocated with an uplink shared physical channel resource and / or a downlink shared physical channel resource only by dynamic scheduling, without being allocated with an uplink dedicated physical channel resource and / or a downlink dedicated physical channel resource. The method includes the following steps: (1) a Node B regularly schedules and sends out a downlink scheduling grant channel to UE and the grant channel is used for carrying synchronous offset commands; (2) the UE receives the downlink scheduling grant channel and adjusts uplink synchronization timing according to the synchronous offset command on the grant channel, and then sends out an uplink channel to the Node B according to the new uplink synchronization timing, thus maintaining the uplink synchronization.

Description

Technical field [0001] The present invention relates to a synchronous wireless communication system, in particular to a synchronization maintaining method in a time division synchronous code division multiple access system, that is, a TD-SCDMA system. Background technique [0002] In the TD-SCDMA wireless communication system, the uplink synchronization of the uplink channel is one of the key technologies. The so-called uplink synchronization means that the uplink signals of each terminal are completely synchronized when they reach the base station. Through uplink synchronization, each code channel using orthogonal spreading codes can be completely orthogonal when despreading at the base station, and multiple access interference will not occur between each other. In the asynchronous code division multiple access (CDMA) technology, the code channel signals transmitted by each mobile terminal arrive at the base station at different times, and the code channels are non-orthogonal, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W56/00H04W72/12
Inventor 张银成陈慧刘虎
Owner ZTE CORP