Method and Apparatus for Improving a Transmission Signal Characteristic of a Downlink Signal in a TDMA Wireless Communication System
a transmission signal and wireless communication technology, applied in the field of cellular wireless communications networks, can solve the problems of poor carrier signal to interference signal power ratio (c/i), inability to provide the same level and type of services, user equipment, etc., and achieve the effect of improving the signal characteristic of the downlink signal received
Inactive Publication Date: 2012-07-05
ROCKSTAR BIDCO
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AI Technical Summary
Benefits of technology
This approach enhances data throughput for edge-of-cell user equipment, enabling the delivery of the same service levels as closer user equipment while minimizing capacity reduction compared to scheduling-based solutions, thereby improving user equipment coverage without significant network capacity loss.
Problems solved by technology
A problem is encountered in cellular wireless communications networks in which user equipments receiving downlink signals at locations towards the outer edges of the networks' cells may experience poor carrier signal to interference signal power ratios (C / I).
One consequence of this is that it may not be possible to provide the same levels and types of services, particularly broadband data services, to such user equipments than is possible for user equipments located much closer to system signal sources such as base stations.
Alternatively, whilst similar services may be delivered to user equipments located in the outer margins of the cells, the service bit rates for such services may have to be considerably reduced which means that the service being provided is delivered at a much slower rate, is delivered without all the normally available features or is at a greater risk of interruption or disconnection.
Method used
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[0021]The best mode of the invention will now be described with reference to the accompanying figures.
[0022]FIG. 1 is a schematic representation of a cellular wireless communications network. The network comprises a plurality of contiguous cells 1 to 7, each cell being served by a respective base station 8 to 14 which each comprise a downlink signal source for user equipments 15 located in their respective cells. For ease of convenience, the cells 1 to 7 are schematically represented as being hexagonal in coverage area and only one user equipment is shown as being located towards an edge of the cell denoted 1 adjacent to the cell denoted as 4. It will be understood that each cell will be occupied by a plurality of user equipments and that the downlink signals transmitted by the various base stations 8 to 14 do not abruptly end at the boundaries of the cells but that such signals may be received by a user equipment located in a different cell.
[0023]The user equipment (UE) 15 depicted...
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The invention relates to improving the quality of a received downlink signal in a time division multiple access wireless cellular communications network. The method of the invention comprises measuring a signal quality characteristic at a user equipment and comparing this to a threshold to determine if a desired signal quality level exists. If so then a certain level or type of service on the downlink can be effected. If not, the method comprises identifying an interferer signal or signals and removing at least one of such interferer signals by arranging for it to either not be transmitted on the same TDMA timeslot as the downlink signal or to be transmitted at a lower power, for example, in said timeslot.
Description
[0001]The present invention relates to a method and apparatus for improving a transmission signal characteristic of a downlink signal received at a user equipment in a time division multiple access (TDMA) wireless communication system and particularly but not exclusively to the utilisation of such method and apparatus in a TDMA cellular wireless communications system.BACKGROUND[0002]A problem is encountered in cellular wireless communications networks in which user equipments receiving downlink signals at locations towards the outer edges of the networks' cells may experience poor carrier signal to interference signal power ratios (C / I). One consequence of this is that it may not be possible to provide the same levels and types of services, particularly broadband data services, to such user equipments than is possible for user equipments located much closer to system signal sources such as base stations. Alternatively, whilst similar services may be delivered to user equipments loca...
Claims
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IPC IPC(8): H04B7/212H04L12/56H04W16/10H04W16/14H04W24/00H04W36/06
CPCH04W16/10H04W16/14Y02B60/50H04W36/06H04W24/00Y02D30/70
InventorWILSON, KEITH S.SMITH, MARTIN
OwnerROCKSTAR BIDCO