Localized and distributed transmission

a technology of distributed transmission and transmission path, applied in diversity/multi-antenna system, wireless communication, transmission path division, etc., can solve the problems of limited distribution on resource-block, insufficient frequency diversity, etc., and achieve the effect of minimum additional signaling and minimal impact on the transmission schem

Inactive Publication Date: 2011-03-17
TELEFON AB LM ERICSSON (PUBL)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006]Thus, it is an object of the present invention to achieve the benefits of frequency diversity also for transmissions with relatively small payloads. There is thus a need for a transmission scheme where such payloads can be distributed over multiple distributed resource blocks and, as a consequence, in order to efficiently utilize the overall time / frequency grid, data to multiple users can be transmitted within the same physical resource block.
[0009]The present invention offers the advantage of a fully distributed transmission scheme to be used as a complement to localized transmission for introduction into the long-term evolution of downlink radio-access schemes with minimum impact on the transmission scheme and with minimum additional signaling.

Problems solved by technology

However, it has been observed to be a problem that in some cases the payload may not be large enough to fill more than one or perhaps a few resource blocks, which leads to a limitation of the distribution on a resource-block basis, such that sufficient frequency diversity is not achieved.

Method used

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Examples

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Embodiment Construction

[0014]FIG. 1 illustrates a part of a cellular telecommunications system in accordance with the invention. In the illustrated embodiment, the system is part of an enhanced UMTS Radio Access Network (E-UTRA), using an Orthogonal Frequency Division Multiple (OFDM) Access scheme, but the invention can be used in other types of network, as will be apparent. In the illustrated part of the system, there is shown a network node, which, in this case, is a Node B 10, which is in wireless communication with three illustrated user equipments (UEs) 12, 14, 16. As shown in FIG. 1, the Node B 10 includes a controller 20, while the UEs 12, 14, 16 include respective controllers 22, 24, 26. These controllers perform the methods described in more detail below, for determining the allocation of resources.

[0015]The bandwidth available for transmissions from the Node B 10 is divided into a number of sub-carriers, and transmissions from the Node B 10 to the UEs 12, 14, 16 can take place on particular ones...

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Abstract

The available transmission resources on a downlink-shared channel are divided into resource blocks, each resource block comprising a predetermined number of sub-carriers during a predetermined time period. The resource blocks are subdivided into localized resource blocks and distributed resource blocks. A user requiring sufficient resources can be allocated a plurality of said localized resource blocks. A user who would require only a small number of said localized resource blocks can instead be allocated subunits of a plurality of said distributed resource blocks.

Description

FIELD OF THE INVENTION[0001]The present invention relates to methods and arrangements in mobile communication systems, such as cellular mobile communication systems, in particular to resource block allocation and distribution on downlink shared channels.BACKGROUND OF THE INVENTION[0002]The present invention refers in one particular embodiment to localized, resource-block-based transmission on the downlink shared channel of an enhanced UMTS Radio Access Network (E-UTRA). Localized transmission implies that the shared-channel transmission to a certain UE is confined to a set of (physical) resource blocks, where each resource block consists of a certain number LRB of consecutive sub-carriers during one sub frame. The specific set of resource blocks to be used for transmission to a certain UE is selected by the Node B, e.g., based on knowledge of the downlink channel conditions (i.e. channel-dependent scheduling).[0003]Channel-dependent scheduling provides a very efficient means to comb...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04B7/00H04W72/10
CPCH04L5/0007H04L5/0039H04L5/0041H04W72/087H04W72/1263H04B7/06H04L5/0032H04W72/04H04W72/042H04W72/23H04W72/543
Inventor PARKVALL, STEFANDAHLMAN, ERIKWAN, LEI
Owner TELEFON AB LM ERICSSON (PUBL)
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