Resource allocation to users in slotted code division multiple access system using beams

Patent metadata

Field	Value
Publication number	US-9380588-B2
Application number	US-201113308970-A
Country	US
Kind code	B2
Filing date	Dec 1, 2011
Priority date	May 13, 2002
Publication date	Jun 28, 2016
Grant date	Jun 28, 2016

Abstract

The invention includes several embodiments for slot assignment in code division multiple access communication systems. One embodiment for fixed beams assigns slots by first detecting a beam having the best received quality and selected the best slot from that beam. Another fixed beam embodiment determines the best slot or slots in a number of beams and determines the overall best beam/slot combination. Another fixed beam embodiment uses a modified interference factor. One embodiment for the uplink using adaptive arrays using a spatial analysis stage followed by a transmission power level estimation stage. An overall interference level associated with each slot is determined and a slot having the best overall quality is determined. Another embodiment for the downlink uses the spatial analysis and slot assignment of the uplink for the downlink. Another embodiment for the downlink uses a spatial and transmission power level estimation stages.

First claim

What is claimed is:

1. A base station comprising:
a receiver configured to receive from a wireless transmit/receive unit (WTRU) an indication of a number of beams, from which a beam having a determined quality is selected, wherein the number of the beams is variable, wherein the determined quality of the selected beam is derived from a quality factor measured in at least one of a plurality of time slots; and
a transmitter configured to transmit to the WTRU an assignment, wherein the assignment is based on the selected beam and the quality factor power associated with measured time slots.

2. The base station of claim 1 , wherein the plurality of time slots are slots of a wideband code division multiple access (W-CDMA) communication system.

3. The base station of claim 1 , wherein the determined quality of the selected beams is derived from a received signal strength.

4. A method for operation in a base station, the method comprising:
receiving from a wireless transmit/receive unit (WTRU) an indication of a number of beams, from which a beam having a determined quality is selected, wherein the number of the beams is variable, wherein the determined quality of the selected beam is derived from a quality factor measured in at least one of a plurality of time slots; and
transmitting to the WTRU an assignment, wherein the assignment is based on the selected beam based on the selected beam and the quality factor associated with measured time slots.

5. The method of claim 4 , wherein the plurality of time slots are slots of a wideband code division multiple access (W-CDMA) communication system.

6. The method of claim 4 , wherein the determined quality of the selected beams is derived from a received signal strength.

Assignees

• Zeira Eldad
• Interdigital Tech Corp

Inventors

• Zeira Eldad

Classifications

• H04B7/0408 Primary

  using two or more beams, i.e. beam diversity · CPC title

• H04W52/42

  in systems with time, space, frequency or polarisation diversity · CPC title

• H04B7/086

  using weights depending on external parameters, e.g. direction of arrival [DOA], predetermined weights or beamforming · CPC title

• H04W24/10

  Scheduling measurement reports {; Arrangements for measurement reports} · CPC title

• H04B7/0617

  for beam forming · CPC title