Activation and de-activation of semi-persistent scheduling
A method performed by a wireless device, UE, for configuring a semi-persistent scheduling, SPS is described. In accordance with the method, the UE may be configured to monitor a first search space of a physical downlink control channel for downlink control information, DCI, dedicated to the UE. The method may include receiving from the communication network SPS configuration data to configure a second search space to be monitored by the UE for DCI to activate or de-activate the SPS, the second search space being smaller than the first search space, and monitoring the second search space to detect the DCI to activate or de-activate the SPS. A corresponding method may be performed by a network node.
1. A method, performed by a wireless device (UE), for configuring a semi-persistent scheduling (SPS), the UE configured to monitor a first search space of a physical downlink control channel for downlink control information (DCI) dedicated to the UE, the method comprising the UE:
receiving, from a communication network, SPS configuration data to configure a second search space monitored by the UE for detecting DCI to activate or deactivate the SPS, the second search space being a fraction of the first search space and the SPS configuration data being indicative of an integer number n such that the second search space is an n-th fraction of the first search space,
the second search space comprising one control information candidate search space such that the UE only has to perform a blind decoding in the control information candidate search space to identify whether there is DCI for activating or the deactivating of an SPS operation,
the SPS configuration data comprising a set of SPS parameters having a long validity time and the SPS parameters being stored in the UE,
the UE being configured with a discontinuous reception (DRX) cycle longer than a periodicity of SPS resources assigned to the UE,
the SPS configuration comprising an SPS DRX cycle to be applied by the UE when SPS is activated; receiving an information of a modification of a previously stored or applied first search space;
when DCI is identified for activation or the deactivation of an SPS operation,
monitoring the second search space to detect the DCI to activate or deactivate SPS operation; and
switching to one of a previous or default DRX cycle upon deactivation of SPS.
2. The method of claim 1 , wherein the second search space comprises every n-th occasion of the first search space to be monitored for DCI.
3. The method of claim 1 , wherein the first search space is a current common search space or a UE specific search space.
4. The method of claim 1 , wherein the physical downlink control channel is a Physical Downlink Control Channel (PDCCH) according to 3GPP LTE specifications, or a Narrowband Physical Downlink Control Channel (NPDCCH) according to 3GPP narrowband LTE specifications.
5. The method of claim 1 , wherein the DCI is received from a radio access network node performing wireless communication with the UE.
6. The method of claim 1 , wherein the SPS configuration data is received from a radio access network node performing wireless communication with the UE or from a mobility management node for managing the mobility of the UE.
7. A method, performed by a network node, for configuring a wireless device (UE) with semi-persistent scheduling (SPS), the method comprising:
sending, to the UE, SPS configuration data to configure a second search space monitored by the UE for detecting downlink control information (DCI) to activate or deactivate SPS, the SPS configuration data comprising a set of SPS parameters having a long validity time and the SPS parameters being stored in the UE, the UE being configured with a discontinuous reception (DRX) cycle longer than a periodicity of SPS resources assigned to the UE, the SPS configuration comprising an SPS DRX cycle to be applied by the UE when SPS is activated;
configuring the UE to switch to one of a previous or default DRX cycle upon deactivation of SPS;
receiving an information of a modification of a previously stored or applied first search space; and
the second search space being a fraction of a first search space of a physical downlink control channel for DCI dedicated to the UE and the SPS configuration data being indicative of an integer number n such that the second search space is an n-th fraction of the first search space, the second search space comprising one control information candidate search space such that the UE only has to perform a blind decoding in the control information candidate search space to identify whether there is DCI for activating or the deactivating of an SPS operation.
8. The method of claim 7 , wherein the second search space comprises every n-th occasion of the first search space.
9. The method of claim 7 , wherein the physical downlink control channel is a Physical Downlink Control Channel (PDCCH) according to 3GPP LTE specifications, or a Narrowband Physical Downlink Control Channel (NPDCCH) according to 3GPP narrowband LTE specifications.
10. The method of claim 7 , further comprising inserting, into the second search space, SPS control information to activate or deactivate SPS.
11. A wireless device (UE) for configuring a semi-persistent scheduling (SPS), the UE comprising: processing circuitry; memory containing instructions executable by the processing circuitry whereby the UE is operative to:
monitor a first search space of a physical downlink control channel for downlink control information (DCI) dedicated to the UE;
receive, from a communication network, SPS configuration data to configure a second search space monitored by the UE for detecting DCI to activate or deactivate the SPS, the second search space being a fraction of the first search space and the SPS configuration data being indicative of an integer number n such that the second search space is an n-th fraction of the first search space, the second search space comprising one control information candidate search space such that the UE only has to perform a blind decoding in the control information candidate search space to identify whether there is DCI for activating or the deactivating of an SPS operation, the SPS configuration data comprising a set of SPS parameters having a long validity time and the SPS parameters being stored in the UE, the UE being configured with a discontinuous reception (DRX) cycle longer than a periodicity of SPS resources assigned to the UE, the SPS configuration comprising an SPS DRX cycle to be applied by the UE when SPS is activated;
receive an information of a modification of a previously stored or applied first search space;
when DCI is identified for activation or the deactivation of an SPS operation, monitor the second search space for detecting the DCI to activate or deactivate an SPS operation; and switch to one of a previous or default DRX cycle upon deactivation of SPS.
12. A network node for configuring a wireless device (UE) with a semi-persistent scheduling (SPS), the network node comprising:
processing circuitry;
memory containing instructions executable by the processing circuitry whereby the network node is operative to:
send, to the UE, SPS configuration data to configure a second search space monitored by the UE for detecting downlink control information (DCI) to activate or deactivate SPS, the SPS configuration data comprising a set of SPS parameters having a long validity time and the SPS parameters being stored in the UE, the UE being configured with a discontinuous reception (DRX) cycle longer than a periodicity of SPS resources assigned to the UE, the SPS configuration comprising an SPS DRX cycle to be applied by the UE when SPS is activated;
configure the UE to switch to one of a previous or default DRX cycle upon deactivation of SPS;
receive an information of a modification of a previously stored or applied first search space; and
the second search space being a fraction of a first search space of a physical downlink control channel for DCI dedicated to the UE and the SPS configuration data being indicative of an integer number n such that the second search space is an n-th fraction of the first search space, the second search space comprising one control information candidate search space such that the UE only has to perform a blind decoding in the control information candidate search space to identify whether there is DCI for activating or the deactivating of an SPS operation.