Method and apparatus for identifying and using radio resources in a wireless communication network
A network node, such as a base station, identifies radio resources within an overall bandwidth using a first resource referencing scheme, while a wireless communication device identifies radio resources within an allocated portion of the overall bandwidth using a second resource referencing scheme. Advantageously, the device correctly identifies given radio resources pointed to by a resource identifier expressed according to the first resource referencing scheme, by translating the resource identifier into the second resource referencing scheme according to mapping information that relates the two schemes. Correspondingly, the network node enables the wireless communication device to perform such translations by providing the mapping information either implicitly or explicitly.
1. A method of operation by a wireless communication device with respect to a wireless communication network, the method comprising:
receiving a resource identifier from a network node in the wireless communication network, the resource identifier indicating a value that maps directly to numbered radio resources within a defined portion of radio frequency spectrum, if the resource identifier is received in a device-specific search space, and maps indirectly to the numbered radio resources according to an offset, if the resource identifier is received within a common search space;
identifying the numbered radio resources from the indicated value in dependence on whether the resource identifier was received in the common search space or in the device-specific search space, including identifying the numbered radio resources from the indicated value without use of the offset, if the resource identifier was received in the device-specific search space, and identifying the numbered radio resources from the indicated value and the offset, if the resource identifier was received in the common search space; and
transmitting or receiving on the numbered radio resources.
2. The method of claim 1 , wherein the indicated value is a starting number and wherein identifying the numbered radio resources comprises, if the resource identifier was received in the device-specific search space, interpreting the starting number as indicating a starting physical resource block within a set of physical resource blocks that are numbered according to a numbering scheme referenced to the defined portion of radio spectrum.
3. The method of claim 2 , wherein, if the resource identifier was received in the common search space, interpreting the starting number plus the offset, as indicating the starting physical resource block.
4. The method of claim 1 , wherein the defined portion of radio spectrum spans a subset of physical resource blocks within an overall set of physical resource blocks spanned by an overall bandwidth, and wherein the numbered radio resources are included in the subset of physical resource blocks.
5. The method of claim 1 , wherein identifying the numbered radio resources includes identifying a starting numbered radio resource according to the indicated value, if the resource identifier was received in the device-specific search space, or according to the indicated value plus the offset, if the resource identifier was received in the common search space, and identifying remaining ones of the numbered radio resources according to mapping information received from the network node.
6. A wireless communication device comprising:
communication circuitry configured for wireless communication in a wireless communication network; and
processing circuitry operatively associated with the communication circuitry and configured to:
receive a resource identifier from a network node in the wireless communication network, the resource identifier indicating a value that maps directly to numbered radio resources within a defined portion of radio frequency spectrum, if the resource identifier is received in a device-specific search space, and maps indirectly to the numbered radio resources according to an offset, if the resource identifier is received within a common search space;
identify the numbered radio resources from the indicated value in dependence on whether the resource identifier was received in the common search space or in the device-specific search space, including identifying the numbered radio resources from the indicated value without use of the offset, if the resource identifier was received in the device-specific search space, and identifying the numbered radio resources from the indicated value and the offset, if the resource identifier was received in the common search space; and
transmit or receive on the numbered radio resources.
7. The wireless communication device of claim 6 , wherein the indicated value is a starting number and wherein, if the resource identifier was received in the device-specific search space, the processing circuitry is configured to identify the numbered radio resources by interpreting the starting number as indicating a starting physical resource block within a set of physical resource blocks that are numbered according to a numbering scheme referenced to the defined portion of radio spectrum.
8. The wireless communication device of claim 7 , wherein, if the resource identifier was received in the common search space, the processing circuitry is configured to identify the numbered radio resources by interpreting the starting number plus the offset, as indicating the starting physical resource block.
9. The wireless communication device of claim 6 , wherein the defined portion of radio spectrum spans a subset of physical resource blocks within an overall set of physical resource blocks spanned by an overall bandwidth, and wherein the numbered radio resources are physical resource blocks included in the subset.
10. The wireless communication device of claim 6 , wherein the processing circuitry is configured to identify the numbered radio resources by identifying a starting numbered radio resource according to the indicated value, if the resource identifier was received in the device-specific search space, or according to the indicated value plus the offset, if the resource identifier was received in the common search space, and identifying remaining ones of the numbered radio resources according to mapping information received from the network node.