Semi-persistent scheduled resource release procedure in a mobile communication network
View Patent ↗The invention relates to a method for deactivating a semi-persistent resource allocation of a user equipment in an LTE-based mobile communication system. Furthermore, the invention also related to a user equipment and a eNode B implementing this method. To provide a mechanism for deactivating a semi-persistent resource allocation in a LTE system which is not requiring any changes to the Physical layer-to-MAC layer interface and/or preferably no changes to the PDCCH formats agreed by the 3GPP a combination of NDI value and MCS index is defined that is commanding the release of SPS resources. Alternatively, another solution proposed to define a special transport block size that when signaled in a PDCCH is commanding the release of SPS resources.
1. A method for deactivating a semi-persistent resource allocation in an LTE (Long-Term Evolution)-based mobile communication system, wherein a user equipment performs the steps of:
receiving via a control channel from an eNode B control signalling that is including a New Data Indicator and a modulation and coding scheme field, and
deactivating the semi-persistent resource allocation, if the New Data Indicator and the modulation and coding scheme field of the control signalling indicate a combination of a New Data Indicator value being 0 and a modulation and coding scheme index indicating no transport block size information.
2. The method according to claim 1 , wherein the control signalling is protected by a CRC (Cyclic Redundancy Check) field that is masked with an RNTI (Radio Network Temporary Identifier) assigned to the user equipment for identification in signalling procedures related to the semi-persistent resource allocation.
3. The method according to claim 2 , wherein at least one field of the control signalling from the eNode B is set to a predetermined value, for validating said control signalling as a semi-persistent resource deactivation indication.
4. The method according to claim 1 , wherein the modulation and coding scheme field indicates one of plural modulation and coding scheme indices, and there is a subset of at least three indices that indicate no transport block size information, and
wherein the user equipment is deactivating:
a semi-persistent resource allocation for the uplink, in case a first predetermined modulation and coding scheme index of said subset is indicated in the modulation and coding scheme field,
a semi-persistent resource allocation for the downlink, in case a second predetermined modulation and coding scheme index of said subset is indicated in the modulation and coding scheme field, and
a semi-persistent resource allocation for the downlink and a semi- persistent resource allocation for the uplink, in case a third predetermined modulation and coding scheme index of said subset is indicated in the modulation and coding scheme field.
5. The method according to claim 4 , wherein said control signalling is downlink control signalling from the eNode B used for scheduling of downlink transmissions and includes the first predetermined modulation and coding scheme index for deactivating the semi-persistent resource allocation for the uplink.
6. The method according to claim 1 , wherein the reception of the control signalling is acknowledged by the user equipment by transmitting an ACK message to the eNode B.
7. The method according to claim 6 ,wherein the control signalling is comprising a resource allocation field value that is indicating the number of resource blocks allocated to the user equipment and a modulation and coding scheme index that is indicating a modulation and coding scheme, and the method further comprises the step of determining a transport block size yielded by the control signalling based on the resource allocation field value and the modulation and coding scheme index.
8. The method according to claim 1 , wherein the modulation and coding scheme field is indicating one of plural predetermined indices, wherein a non-empty subset of the predetermined indices is used to jointly encode modulation scheme, transport block size and redundancy version for an uplink data transmission, while the remaining indices are used to encode only a redundancy version for an uplink data transmission, or
wherein the modulation and coding scheme field is indicating one of plural predetermined indices, wherein a non-empty subset of the predetermined indices is used to jointly encode modulation scheme and transport block size for a downlink transmission to be received by the user equipment, while the remaining indices are used to encode only a modulation scheme for a downlink transmission.
9. The method according to claim 1 , wherein the control channel is a PDCCH (Physical Downlink Control Channel) and/or the control signalling is comprised of a resource assignment to the user equipment.
10. A method for deactivating a semi-persistent resource allocation to a user equipment in an LTE (Long-Term Evolution)-based mobile communication system, wherein an eNode B performs the steps of:
generating for the user equipment control signalling comprising a New Data Indicator and a modulation and coding scheme field including a combination of a New Data Indicator value being 0 and a modulation and coding scheme index indicating no transport block size information, that is causing the user equipment to deactivate the semi-persistent resource allocation, and
transmitting said control signalling via a control channel to the user equipment to thereby cause the user equipment to deactivate the semi-persistent resource allocation.
11. The method according to claim 10 , wherein the control signalling is protected by a CRC (Cyclic Redundancy Check) field that is masked with an RNTI (Radio Network Temporary Identifier) assigned to the user equipment for identification in signalling procedures related to the semi-persistent resource allocation.
12. The method according to claim 11 , wherein at least one field of the control signalling from the eNode B is set to a predetermined value, for validating said control signalling as a semi-persistent resource deactivation indication.
13. The method according to claim 10 , wherein the modulation and coding scheme field indicates one of plural modulation and coding scheme indices, and there is a subset of at least three indices that indicate no transport block size information, and
wherein the user equipment is deactivating:
a semi-persistent resource allocation for the uplink, in case a first predetermined modulation and coding scheme index of said subset is indicated in the modulation and coding scheme field,
a semi-persistent resource allocation for the downlink, in case a second predetermined modulation and coding scheme index of said subset is indicated in the modulation and coding scheme field, and
a semi-persistent resource allocation for the downlink and a semi- persistent resource allocation for the uplink, in case a third predetermined modulation and coding scheme index of said subset is indicated in the modulation and coding scheme field.
14. The method according to claim 13 , wherein said control signalling is downlink control signalling from the eNode B used for scheduling of downlink transmissions and includes the first predetermined modulation and coding scheme index for deactivating the semi-persistent resource allocation for the uplink.
15. The method according to claim 10 , wherein the reception of the control signalling is acknowledged by the user equipment by transmitting an ACK message to the eNode B.
16. The method according to claim 15 , wherein the control signalling is comprising a resource allocation field value that is indicating the number of resource blocks allocated to the user equipment and a modulation and coding scheme index that is indicating a modulation and coding scheme, and the method further comprises the step of determining a transport block size yielded by the control signalling based on the resource allocation field value and the modulation and coding scheme index.
17. The method according to claim 10 , wherein the modulation and coding scheme field is indicating one of plural predetermined indices, wherein a non-empty subset of the predetermined indices is used to jointly encode modulation scheme, transport block size and redundancy version for an uplink data transmission, while the remaining indices are used to encode only a redundancy version for an uplink data transmission, or
wherein the modulation and coding scheme field is indicating one of plural predetermined indices, wherein a non-empty subset of the predetermined indices is used to jointly encode modulation scheme and transport block size for a downlink transmission to be received by the user equipment, while the remaining indices are used to encode only a modulation scheme for a downlink transmission.
18. The method according to claim 10 ,wherein the control channel is a PDCCH (Physical Downlink Control Channel) and/or the control signalling is comprised of a resource assignment to the user equipment.
19. A user equipment for use in an LTE (Long-Term Evolution)-based mobile communication system comprising:
a receiver for receiving via a control channel from an eNode B control signalling that is including a New Data Indicator and a modulation and coding scheme field, and
a processing unit for deactivating a semi-persistent resource allocation, if the New Data Indicator and the modulation and coding scheme field of the control signalling indicate a combination of a New Data Indicator value being 0 and a modulation and coding scheme index indicating no transport block size information.
20. An eNode B for use in an LTE (Long-Term Evolution)-based mobile communication system comprising:
a scheduler for generating for a user equipment control signalling comprising a New Data Indicator and a modulation and coding scheme field including a combination of a New Data Indicator value being 0 and a modulation and coding scheme index indicating no transport block size information, that is causing the user equipment to deactivate a semi-persistent resource allocation, and
a transmitter for transmitting said control signalling via a control channel to the user equipment to thereby cause the user equipment to deactivate the semi-persistent resource allocation.
21. A non-transitory computer readable medium storing instructions that when executed by a processor of a user equipment cause the user equipment to deactivate a semi-persistent resource allocation in an LTE (Long-Term Evolution)-based mobile communication system, by:
receiving via a control channel from an eNode B control signalling that is including a New Data Indicator and a modulation and coding scheme field, and
deactivating the semi-persistent resource allocation, if the New Data Indicator and the modulation and coding scheme field of the control signalling indicate a combination of a New Data Indicator value being 0 and a modulation and coding scheme index indicating no transport block size information.
22. A non-transitory computer readable medium storing instructions that when executed by a processor of an eNode B, cause the eNode B to deactivate a semi-persistent resource allocation of a user equipment by:
generating for the user equipment control signalling comprising a New Data Indicator and a modulation and coding scheme field including a combination of a New Data Indicator value being 0 and a modulation and coding scheme index indicating no transport block size information, that is causing the user equipment to deactivate the semi-persistent resource allocation, and
transmitting said control signalling via a control channel to the user equipment to thereby cause the user equipment to deactivate the semi-persistent resource allocation.