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Broadcast and multicast on high speed downlink channels

A downlink and physical downlink technology, which is used in broadcast service distribution, wireless communication, and devices that provide special services in branches, and can solve problems such as incorrect decoding of data.

Inactive Publication Date: 2009-07-08
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0050] -1: Data in HS-DSCH TTI is incorrectly decoded, NACK

Method used

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  • Broadcast and multicast on high speed downlink channels
  • Broadcast and multicast on high speed downlink channels
  • Broadcast and multicast on high speed downlink channels

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] According to the invention, multicasting is introduced on the HSPDA radio access interface between a base station group and multiple user entities, wherein specific multicast HSDPA UE addresses are introduced in parallel to normal unicast addresses for simultaneously sending content to Multiple users in at least one cell.

[0082] exist figure 2 Above, a base station (Node B) according to all embodiments of the present invention is shown.

[0083] A base station (Node B) 601 includes a MAC-hs control message processor 602; a scheduler 605; a plurality of input buffers 604, used to store information related to each user entity UE1-UEn, corresponding to messages for processing to several UEs Simultaneous transmission, ie segmentation of data streams of number 1-J of HARQ processes 607 also for each user entity; layer 1 processing means 611 for transmitting data from the respective HARQ processes. The base station also includes a CQI decoder 608 , a user entity (UE) fee...

no. 1 example - example

[0135] An alternative procedure for multicasting a HARQ process at a Node B can be basically as Figure 5 is implemented as shown. However, according to this embodiment, the Node B does not perform any MU_ID-UE_ID mapping.

[0136] In a typical network, the operating point of operation can be approximated as

[0137] 90% - ACK

[0138] 9% - NACK

[0139] 1% - DTX

[0140] It can be seen that NACK is more likely to be received than DTX. According to this alternative embodiment, DTX - represented in block 13 - is not used in determining whether a retransmission should be performed.

[0141] In the given exemplary situation, Node B does not need to know that UE_ID 44, 56, 63 is a member of MU_ID=1. If e.g. a transmission to MU_ID=1 occurs - then UE_ID 44 56 can send an ACK, while UE_ID 63 sends a NACK, - Node B will receive 2 ACKs and 1 NACK, thus assuming only 3 MU_ID=1 members , and resend. If on the other hand it receives 2 ACKs and 1 DTX, it will assume that all user ...

Embodiment 2

[0143] In the second embodiment of the present invention, the same base station configuration as that of the first embodiment of the present invention is used.

[0144] In the user entity according to the second embodiment of the invention, instead of descrambling the CRC with several IDs, that is, the various multicast identities and multicast user identities in question - only one ID is used for one time period . Suitably only one HS_SCCH receiver is provided at the user entity. When multicast content is selected, among user identities UE ID for decoding HS-SCCH channel, switching to multicast identity MU ID is performed; otherwise user entity is used for decoding HS-SCCH channel. Thus, the user entity design is comparable to the prior art user entity design, except for the ability to toggle the ID for decoding normal HSDPA downlink unicast data or one multicast reception group at a time.

[0145] User entities such as Image 6 Works as shown, except only using 202 or onl...

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Abstract

A high speed downlink packet access base station (HSPDA Node B) and a method therefore working in acknowledged mode (AM), the base station being adapted for unicast transmission on a physical downlink shared channel (HS-DSCH), by preceding announcement on a shared control channel (HS-SCCH) which shared control channel may be decoded by a given user entity using its own identity (UE-ID), each user entity (UE) being adapted for transmitting an acknowledge (ACK) or non-acknowledge (NACK) message pertaining to the reception of the given transmission on an uplink dedicated physical control channel (HS-DPCCH) pertaining to a given HARQ process of a given individual user entity. The base station is performing multicast transmissions (11, 401 ) on the physical downlink shared channel (HS-DSCH) by preceding announcement on the shared control channel (HS-SCCH) coded with a multicast identity (MU-ID) of a reserved address space, which downlink shared channel (HS-SCCH) may be decoded simultaneously by a plurality of user entities, wherein each user entity is using the multicast identity (MU-ID) instead of the user entity's respective user identity. A user entity and a method therefore have moreover been provided.

Description

technical field [0001] The present invention relates to methods of HSDPA for downlink broadcast and multicast services such as the transmission of television channels to mobile handsets. Background technique [0002] Digital Terrestrial Television, DVB-H (Digital Video Broadcasting-Handset) is a solution for television on mobile handsets based on and largely compatible with the digital terrestrial broadcasting standard DVBT. DVBH is implemented by means of the DVBT standard with OFDM multicarrier modulation. The extended DVBH parameter signaling is added above the DVB-T protocol layer, so that DVBH services can be sent via the DVB-T network. Added features relate to time slicing and enhanced forward error correction, respectively mitigating handset power consumption and improving reception under poor signal conditions. [0003] Downlink transmission of television channels can be envisaged in various ways. One option is to integrate the terrestrial television receiver into...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W4/06H04W48/12H04L12/18
CPCH04W72/005H04L12/1868H04W48/12H04L12/189H04W72/30
Inventor J·林德斯科格A·兰海姆
Owner TELEFON AB LM ERICSSON (PUBL)