Method And Apparatus For Allocating A Pilot Signal Adapted To The Channel Characteristics

摘要

A set of different pilot structures are designed for use in different environments and/or different user behaviours that are expected to occur in a cell. The radio conditions for a user are estimated. Each user is then assigned an area (108A-E) in resource space for its communication, which has a suitable pilot configuration. In one embodiment, the entire resource space is provided with different pilot structures in different parts (110A-D) In advance and allocation of resources to the users are then performed in order to match estimated radio conditions to the provided pilot structure. In another embodiment, allocation is performed first, and then the actual pilot structure is adapted within the allocated resource space area to suit the environmental conditions.

主权项

1. Method for wireless communication in a multi-user, multi-carrier communications system, using a multi-carrier resource space of at least two dimensions, of which one is frequency, said multi-carrier communications system allowing a data stream to be separated into a series of parallel data streams, each of which is modulated and simultaneously transmitted with a different frequency, comprising the step of:
allocating a first resource sub-space of entire said multi-carrier resource space for communication between a first node and a second node; said first resource sub-space comprising resources of more than one carrier; obtaining data associated with estimated radio conditions for communication between the first node and the second node; allocating a second resource sub-space of entire said multi-carrier resource space for communication between the first node and a third node; said second resource sub-space comprising resources of more than one carrier, obtaining data associated with estimated radio conditions for communication between the first node and the third node; and providing access to the use of at least two pilot resource configurations, intended for different estimated node radio conditions, whereby the first resource sub-space is associated a pilot resource configuration, being in agreement with pilot need for the estimated radio conditions for the second node and the second resource sub-space is associated a pilot resource configuration, being in agreement with pilot need for the estimated radio conditions for the third node; and whereby at least one of the first resource sub-space and the second resource sub-space comprises a carrier having both pilot resources and data resources within said first resource sub-space or said second resource subspace, respectively.