Managing uplink resources in a cellular radio communications system
The technology in this application provides a method and apparatus for efficiently using common uplink radio resources, e.g. a common uplink enhanced-dedicated physical channel (E-DCH) resource. A UE releases a common E-DCH resource very quickly after a completed transmission. In addition or alternatively, a base station may release a common E-DCH resource configuration from the network side to free up common E-DCH resources for use by other UEs. A low overhead signaling scheme for quickly and effectively releasing of common E-DCH resources between a UE and a base station is also described. For example, existing signaling fields on protocol layer 2 (L 2 ) or layer 1 (L 1 ) may be used. In one preferred example embodiment, signaling fields already in use in a CELL_DCH service state are given a different meaning for UEs in a CELL_FACH service state so that common E-DCH resources are quickly and effectively released.
1. A method implemented in a radio base station of releasing a common Enhanced Dedicated Channel (E-DCH) resource allocated for use by a User Equipment (UE) in a CELL_FACH state, comprising:
the radio base station determining that the common E-DCH resource allocated to the UE should be released; and
the radio base station sending an inactive grant on a E-DCH resource grant channel to the UE instructing the UE to release the common E-DCH resource,
wherein the inactive grant on the E-DCH resource grant channel means that the release is executed even though there are outstanding unfinished Hybrid Automatic Repeat Request (HARQ) processes associated with the UE's transmission to the base station using the allocated common E-DCH resource.
2. The method according to claim 1 , further comprising:
setting a release timer with a predetermined value associated with the common E-DCH resource; and
releasing the common E-DCH resource upon expiry of the release timer.
3. Radio base station apparatus for releasing a common Enhanced Dedicated Channel (E-DCH) resource in a radio base station allocated for use by a User Equipment (UE) in a CELL_FACH state, comprising electronic circuitry arranged to:
determine that the common E-DCH resource allocated to the UE should be released; and
send an inactive grant on a common E-DCH resource grant channel instructing the UE to release the common E-DCH resource,
wherein the inactive grant on the common E-DCH resource grant channel means that the release is executed even though there are outstanding unfinished Hybrid Automatic Repeat Request (HARQ) processes associated with the UE's transmissions to the base station using the allocated common E-DCH resource.
4. The radio base station apparatus according to claim 3 , further comprising:
a release timer with a predetermined value associated with the common E-DCH resource,
wherein the electronic circuitry is arranged to release the common E-DCH resource upon expiry of the release timer.