Methods of efficient wideband operation for intra-band non-contiguous spectrum
A method of efficient wideband operation for intra-band non-contiguous spectrum using extending bandwidth part (BWP) configuration is proposed. The BWP definition is extended to cluster BWPs to aggregate distributed spectrum blocks within a frequency range (e.g., 200 MHz) by single carrier operation and facilitate UE to filter out the transmission of unknown RAT between any two of the distributed spectrum blocks. In addition, the cluster BWP configuration enables dynamic aggregation of the number and location of the distributed spectrum blocks based on LBT results in unlicensed spectrum. Specifically, the BWP definition is extended to a group of one or multiple radio resource clusters, each of which contains a set of contiguous PRBs in frequency domain within the associated carrier.
1. A method comprising:
receiving a high-layer signaling of a set of UE-specific downlink (DL) or uplink (UL) bandwidth part (BWP) configurations from a base station by a user equipment (UE) over an initial DL BWP in a single carrier bandwidth, wherein a single UE-specific DL or UL BWP contains multiple radio resource clusters, wherein each radio resource cluster contains a set of contiguous resource blocks (RBs) in frequency domain, wherein all the multiple radio resource clusters of the single UE-specific DL or UL BWP always apply the same numerology including the same OFDM subcarrier spacing and the same cyclic prefix length of the single UE-specific DL or UL BWP,
wherein guard bands are reserved at two sides of and within each radio resource cluster in the single UE-specific DL or UL BWP in frequency domain;
performing a random-access channel (RACH) procedure using the initial DL BWP and an initial uplink (UL) BWP; and
receiving a DL or UL BWP switch signal over the initial DL BWP to switch from the initial DL or UL BWP to an active DL or UL BWP, respectively.
2. The method of claim 1 , wherein the set of DL or UL BWP configurations for a BWP comprises a starting RB index of each radio cluster in the BWP, an ending RB index or a bandwidth of each radio cluster in the BWP, a subcarrier spacing, and a cyclic prefix.
3. The method of claim 1 , wherein the initial DL BWP is defined by an essential DL control resource set (CORESET) configuration contained in master essential system information.
4. The method of claim 3 , wherein the initial DL BWP and the initial UL BWP are further configured by secondary essential system information.
5. The method of claim 4 , wherein the initial DL BWP is a multi-cluster BWP, and wherein one of the radio resource clusters within the initial DL BWP contains an essential DL control resource set (CORESET).
6. The method of claim 4 , wherein the initial UL BWP is a multi-cluster BWP, wherein one of the radio resource clusters within the initial UL BWP contains RACH resource for licensed spectrum, wherein each radio resource cluster within the initial UL BWP contains RACH resource for unlicensed spectrum.
7. The method of claim 1 , wherein the UE reports UE BWP capability to the base station, the UE BWP capability comprises a maximal number of radio resource clusters of a UE-specific DL BWP and a maximal number of radio resource clusters of a UE-specific UL BWP.
8. The method of claim 1 , further comprising:
aggregating and indexing RBs of all radio resource clusters within the active DL or UL BWP; and
determining RBs of a scheduled physical DL or UL shared channel based on scheduling information and the indexing of the aggregated RBs.
9. The method of claim 8 , wherein the aggregated RBs within the active DL or UL BWP is indexed by RBs from a lower frequency location to a higher frequency location based on a subcarrier spacing of the active DL or UL BWP.
10. The method of claim 1 , wherein the UE filters received signal in each radio resource cluster in the active DL BWP in an unlicensed spectrum, wherein the UE performs serving RAT signal detection and decoding in each radio resource cluster in the active DL BWP.
11. The method of claim 1 , wherein the UE performs Listen Before Talk (LBT) in the active UL BWP in an unlicensed spectrum, wherein the UE transmits serving RAT signal in a radio cluster with successful LBT.
12. A User Equipment (UE) comprising:
a receiver that receives a high-layer signaling of a set of UE-specific downlink (DL) or uplink (UL) bandwidth part (BWP) configurations from a base station over an initial DL BWP in a single carrier bandwidth, wherein a single UE-specific DL or UL BWP contains multiple radio resource clusters, wherein each radio resource cluster contains a set of contiguous resource blocks (RBs) in frequency domain, wherein all the multiple radio resource clusters of the single UE-specific DL or UL BWP sham always apply the same numerology including the same OFDM subcarrier spacing and the same cyclic prefix length of the single UE-specific DL or UL BWP, and wherein guard bands are reserved at two sides of each radio resource cluster in the single UE-specific DL or UL BWP in frequency domain;
a random-access channel (RACH) handling circuit that performs a RACH procedure using the initial DL BWP and an initial uplink (UL) BWP; and
a BWP handling circuit that receives a DL or UL BWP switch signal over the initial DL BWP such that the UE switches from the initial DL or UL BWP to an active DL or UL BWP, respectively.
13. The UE of claim 12 , wherein the set of DL or UL BWP configurations for a BWP comprises a starting RB index of each radio cluster in the BWP, an ending RB index or a bandwidth of each radio cluster in the BWP, a subcarrier spacing, and a cyclic prefix.
14. The UE of claim 12 , wherein the initial DL BWP is defined by an essential DL control resource set (CORESET) configuration contained in master essential system information.
15. The UE of claim 14 , wherein the initial DL BWP and the initial UL BWP are further configured by secondary essential system information.
16. The UE of claim 15 , wherein the initial DL BWP is a multi-cluster BWP, and wherein one of the radio resource clusters within the initial DL BWP contains an essential DL control resource set (CORESET).
17. The UE of claim 15 , wherein the initial UL BWP is a multi-cluster BWP, wherein one of the radio resource clusters within the initial UL BWP contains RACH resource for licensed spectrum, and wherein each radio resource cluster within the initial UL BWP contains RACH resource for unlicensed spectrum.
18. The UE of claim 12 , wherein the UE reports UE BWP capability to the base station, the UE BWP capability comprises a maximal number of radio resource clusters of a UE-specific DL BWP and a maximal number of radio resource clusters of a UE-specific UL BWP.
19. The UE of claim 12 , wherein the UE aggregates RBs of all radio resource clusters within the active DL or UL BWP, and determines RBs of a scheduled physical DL or UL shared channel based on scheduling information and indexing of the aggregated RBs.
20. The UE of claim 19 , wherein the aggregated RBs within the active DL or UL BWP is indexed by RBs from a lower frequency location to a higher frequency location based on a subcarrier spacing of the active DL or UL BWP.
21. The UE of claim 12 , wherein the UE filters received signal in each radio resource cluster in the active DL BWP in an unlicensed spectrum, wherein the UE performs serving RAT signal detection and decoding in each radio resource cluster in the active DL BWP.
22. A method comprising:
receiving a high-layer signaling of a set of UE-specific downlink (DL) or uplink (UL) bandwidth parts (BWPs) for a serving cell from a base station by a user equipment (UE) over an initial DL BWP in a primary cell, wherein a BWP configuration of each UE-specific DL or UL BWP in the higher-layer signaling includes at least a set of radio resource clusters;
determining frequency locations of each one of the set of radio resource clusters of a UE-specific DL or UL BWP based on a set of contiguous physical resource blocks (PRBs) and a same numerology of the UE-specific DL or UL BWP, wherein guard bands are reserved at two sides of and within each radio resource cluster in each of the UE-specific DL or UL BWPs in frequency domain; and
receiving a DL or UL BWP switch signal over the initial DL BWP to switch an active DL or UL BWP from one DL or UL BWP to another DL or UL BWP for the serving cell, respectively.