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Multicast service subline data transmission method and device

A multicast service and downlink data technology, applied in the direction of selection device, broadcast service distribution, code division multiplexing system, etc., can solve the problems of limited capacity, reduce the capacity of PTT users, and limit the number of users, so as to improve the PTT User capacity and the effect of saving air interface frequency resources

Inactive Publication Date: 2007-12-05
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even if the listeners are all concentrated in one or a few limited cells, this situation cannot be optimized, which wastes precious frequency resources and reduces the PTT user capacity of the entire system
[0008] 2. Since the channel resources of a cell are limited, if each user needs a dedicated channel, then the maximum number of PTT users in a cell must be limited by downlink resources: in the case of a typical configuration of uplink and downlink time slots of 3:3 , each time slot has a maximum of 16 physical channels, and a cell has a maximum of 48 downlink physical channels
In this way, the demand for some private networks cannot be met, which limits the application of the system
While the capacity is limited, the feasibility of large-capacity multicast services is almost impossible
[0009] 3. Since the downlink adopts a dedicated code division channel, the downlink power control must be performed, so the uplink must also be configured with a dedicated control channel to send uplink measurement reports
This causes the number of users in the cell to be further limited by uplink resources
Similar to the limitation of downlink channel resources, it will lead to limitations in the application of PTT services

Method used

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  • Multicast service subline data transmission method and device
  • Multicast service subline data transmission method and device
  • Multicast service subline data transmission method and device

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Embodiment Construction

[0043] In order to make those skilled in the art understand the present invention more clearly, the application environment specifically involved in the present invention will be briefly described below.

[0044] Referring to Fig. 2, this figure is a schematic diagram of the TD-SCDMA wireless interface protocol system applied in the present invention.

[0045] The air interface in the present invention refers to the Uu interface between the UE and the network, which consists of L1, L2 and L3. L1 is based on TD-SCDMA technology, and L2 and L3 are the same as UTRA TDD mode.

[0046] As shown in FIG. 2 , the physical layer connects the medium access control (MAC) sublayer of L2 and the radio resource management (RRC) sublayer of L3. Circles between different layers / sublayers in the figure represent Service Access Points (SAPs). The physical layer provides different transmission channels to the MAC layer, and the transmission mode of information on the wireless interface determi...

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Abstract

This invention discloses a down data transmission method for multicast business used to TDM-CDMA system, which comprises mainly: predetermining mapping relation between the special business channel for user device in group and one down physical channel; carrying the multicast business for user device in group by one down physical channel according to mapping relation and broadcasting one multicast business to every user device. Besides, the invention also discloses a corresponding down transmission device. this invention solves the resource share problem and saves resource.

Description

technical field [0001] The present invention relates to multicast technology, more specifically, the present invention relates to a kind of method that is applied to the multicast service data transmission in Time Division Multiplex Code Division Multiple Access system (TD-SCDMA, Time Division-Synchronization Code Division Multiple Access) system and device. Background technique [0002] At present, mobile communication has developed to the third generation of mobile communication (3G, Third Generation). , one of the three main standards for third-generation mobile communications recognized by The 3rdGeneration Partnership Project. As a 3G standard of time-division multiplexing, TD-SCDMA is regarded as a time-division multiplexing technical solution with a low chip rate (1.28MCps, 1.28 megachips / second) in the ITU standard. [0003] With the gradual maturity of TD-SCDMA technology, the traditional trunking communication system can also be applied in the 3G mobile system ba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04Q7/00H04B7/26H04J13/00H04W4/06
Inventor 罗琨
Owner HUAWEI TECH CO LTD
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