Resource exchange discovery in a cellular communication system
A cellular communication system comprises a set of base stations ( 201,203 ) which transmit downlink resource exchange discovery messages to remote terminals in resource allocations of a Media Access Control, MAC, frame structure. The discovery messages may indicate that a base station has resource available for reallocation to another base station or that a base station is seeking resource to be allocated from another base station. A remote terminal ( 205 ) comprises a receiver ( 401, 403 ) which receives a first message of the downlink resource exchange discovery messages from at least a first base station ( 201 ). A discovery message transmit processor ( 407 ) generates a second message, which is an uplink resource exchange message comprising resource exchange data determined from the first message, and transmits this to a second base station ( 203 ). The second base station ( 203 ) then initiates a temporary air interface resource reallocation with the first base station in response to receiving the second message.
1. A cellular communication system; comprising
a set of base stations arranged to transmit downlink resource exchange discovery messages to remote terminals in resource allocations of a Media Access Control, MAC, frame structure;
at least one remote terminal comprising:
means for receiving a first message of the downlink resource exchange discovery messages from at least a first base station of the set of base stations;
means for generating a second message being an uplink resource exchange message comprising resource exchange data determined from the first message; and
means for transmitting the second message to a second base station; and wherein
the second base station is arranged to initiate a temporary air interface resource reallocation with the first base station in response to receiving the second message.
2. The cellular communication system of claim 1 wherein the first base station is a base station having available air interface resource for other base stations and the first message is a discovery message comprising an indication of the available air interface resource.
3. The cellular communication system of claim 2 wherein the first message comprises an indication of a parameter selected from the group consisting of:
a. a network address of the first base station;
b. an identity of the first base station;
c. an indication of at least one characteristic of the available air interface resource;
d. a cost associated with the available air interface resource; and
e. an indication of other available air interface resource.
4. The cellular communication system of claim 1 wherein the second base station comprises means for transmitting a resource evaluation command to the first remote terminal; the first remote terminal comprises means for determining a resource evaluation criterion in response to the resource evaluation command; and the means for transmitting is arranged to transmit the second message only if the available air interface resource meets the resource evaluation criterion.
5. The cellular communication system of claim 1 wherein the resource evaluation criterion comprises a requirement that at least one characteristic of the available air interface resource of the first message meets a requirement for resource as indicated by the resource evaluation command.
6. The cellular communication system of any of claim 1 wherein the second message comprises an indication of the available air interface resource from the first base station.
7. The cellular communication system of claim 6 wherein the second base station comprises means for transmitting a request for a temporary resource allocation of resource from the first base station to the second base station if the available air interface resource matches a requested air interface resource at the second base station.
8. The cellular communication system of claim 1 wherein the first base station is a base station requesting available air interface resource from other base stations and the first message is a discovery message comprising an indication of the requested air interface resource.
9. A method of resource exchange discovery in a cellular communication system; the method comprising
a set of base stations transmitting downlink resource exchange discovery messages to remote terminals in resource allocations of a Media Access Control, MAC, frame structure;
at least one remote terminal performing the steps of:
receiving a first message of the downlink resource exchange discovery messages from at least a first base station of the set of base stations,
generating a second message being an uplink resource exchange message comprising resource exchange data determined from the first message, and
transmitting the second message to a second base station; and
the second base station initiating a temporary air interface resource reallocation with the first base station in response to receiving the second message.