Bandwidth part switching
Arrangement for switching between an active bandwidth part and the target bandwidth part are disclosed. A method includes selecting one or more resource blocks comprised in the target bandwidth part for a transmission or reception between the wireless device and the network node. The selected resource blocks to be used in the target bandwidth part are indicated in a resource allocation field of a downlink control channel information in the active bandwidth part. The allocation field includes information bits and the resource allocation field in the active bandwidth part and the information bits are configured based on a target bandwidth part resource allocation type. The target bandwidth part resource allocation type indicates whether the information bits have a bitmap corresponding to one or more resource block groups or an integer value corresponding to a starting resource block and a length of the allocation in resource blocks.
1. A method performed by a user equipment, UE, configured for dynamic bandwidth part, BWP, switching between an active BWP and a target BWP, the method comprising:
receiving, from a network node, an indication of resource blocks, selected by the network node to be used by the UE in the target BWP, in a resource allocation field of a downlink control information in the active BWP, the resource allocation field comprising information bits for allocating one or more resource blocks for the target BWP;
determining a target BWP resource allocation type based on a relationship between the resources allocated for the target BWP and resources allocated for the active BWP, the target BWP resource allocation type indicating whether the information bits of a resource allocation field in a downlink control information comprise a bitmap corresponding to one or more resource block groups or an integer value corresponding to a starting position and a length of the allocation; and
interpreting the information bits based on the determined target bandwidth part resource allocation type.
2. The method of claim 1 , wherein the relationship corresponds to a difference in a number of information bits in the resource allocation field of the downlink control information in the active BWP compared to a number of information bits in a resource allocation field for the target BWP.
3. The method of claim 1 , wherein the target BWP resource allocation type is preconfigured to a value according to the relationship.
4. The method of claim 1 , further comprising interpreting the bits of the resource allocation field when the resource allocation field is truncated or padded.
5. The method of claim 1 , wherein:
the target BWP is configured for a greater number of resource blocks than the number configured for the active BWP and the number of information bits available in the resource allocation field of the downlink control information in the active BWP is less than a number of information bits available in a resource allocation field in the target BWP and the bits of the resource allocation field are padded.
6. The method of claim 1 , wherein:
the target BWP is used to allocate a smaller number of resource blocks than allocated for the active BWP and the number of information bits in the resource allocation field of the downlink control information in the active BWP is greater than a number of information bits in a resource allocation field in the target BWP and the remaining bits of the resource allocation field are truncated.
7. A method performed by a network node for switching between an active bandwidth part, BWP, and a target BWP, for a user equipment, UE, which supports dynamic bandwidth part switching based on a relationship between resources allocated for the target BWP and resources allocated for the active BWP, the method comprising:
indicating to the UE, the resource blocks, selected by the network node to be used in the target BWP in a resource allocation in a field of a downlink control channel information in an active BWP, the allocation field comprising information bits configured according to a target BWP resource allocation type, the target BWP resource allocation type indicating whether information bits of a resource allocation field in a downlink control information comprise a bitmap corresponding to one or more resource block groups or an integer value corresponding to a starting position and a length of the allocation, and the target BWP resource allocation type is based on the relationship between resources allocated for the target BWP and resources allocated for the active BWP.
8. The method of claim 7 , wherein the relationship corresponds to a difference in a number of information bits in the resource allocation field of the downlink control information in the active BWP compared to a number of information bits in a resource allocation field for the target BWP.
9. The method of claim 7 , wherein one of:
the UE is configured for dynamic switching between resource allocation types for the target BWP and the target BWP resource allocation type is preconfigured to a value according to the relationship; and
the UE is configured for dynamic switching between resource allocation types for the target BWP, the target BWP resource allocation type is indicated by a resource allocation type subfield of the resource allocation field in a downlink control information in the target BWP.
10. The method of claim 7 , wherein one of:
the target BWP is configured for a greater number of resource blocks than the number configured for the active BWP and the number of information bits available in the resource allocation field of the downlink control information in the active BWP is less than a number of information bits available in a resource allocation field in the target BWP and the bits of the resource allocation field are padded; and
the target BWP is used to allocate a smaller number of resource blocks than allocated for the active BWP and the number of information bits in the resource allocation field of the downlink control information in the active BWP is greater than a number of information bits in a resource allocation field in the target BWP and the remaining bits of the resource allocation field are truncated.
11. A user equipment, UE, supporting dynamic bandwidth part, BWP, switching between an active BWP and a target BWP the UE configured to:
receive an indication of resource blocks, selected by a network node to be used by the UE in the target BWP, in a resource allocation field in a downlink control information in the active BWP, the resource allocation field comprising information bits for allocating one or more resource blocks for the target BWP;
determine the resource allocation type based on a relationship between the resources allocated for the target BWP and the resources allocated for the active BWP, the target BWP resource allocation type indicating whether the information bits of a resource allocation field in a downlink control information comprise a bitmap corresponding to one or more resource block groups or an integer value corresponding to a starting position and a length of the allocation; and
interpret the information bits based on the determined target bandwidth part resource allocation type.
12. The UE of claim 11 , wherein the relationship corresponds to a difference in a number of information bits in the resource allocation field of the downlink control information in the active BWP compared to a number of information bits in a resource allocation field for the target BWP.
13. The UE of claim 11 , wherein the target BWP resource allocation type is preconfigured to a value according to the relationship.
14. The UE of claim 11 , wherein the UE is further configured to interpret the bits of the resource allocation field when the resource allocation field is truncated or padded.
15. The UE of claim 11 , wherein:
the target BWP is configured for a greater number of resource blocks than the number configured for the active BWP and the number of information bits available in the resource allocation field of the downlink control information in the active BWP is less than a number of information bits available in a resource allocation field in the target BWP and the bits of the resource allocation field are padded.
16. The UE of claim 11 , wherein:
the target BWP is used to allocate a smaller number of resource blocks than allocated for the active BWP and the number of information bits in the resource allocation field of the downlink control information in the active BWP is greater than a number of information bits in a resource allocation field in the target BWP and the remaining bits of the resource allocation field are truncated.
17. A network node for switching between an active bandwidth part, BWP, and a target BWP, for a user equipment, UE, which supports dynamic bandwidth part switching based on a relationship between resources allocated for the target BWP and resources allocated for the active BWP, the network node configured to:
indicate to the UE, the resource blocks selected by the network node, to be used by the UE in the target BWP, in a resource allocation in a field of a downlink control channel information in an active BWP, the allocation field comprising information bits configured according to a target BWP resource allocation type wherein the target BWP resource allocation type indicates whether information bits of a resource allocation field in a downlink control information comprise a bitmap corresponding to one or more resource block groups or an integer value corresponding to a starting position and a length of the allocation and the resource allocation type is determined based on a relationship between resources allocated for the target BWP and resources allocated for the active BWP.
18. The network node of claim 17 , wherein the relationship corresponds to a difference in a number of information bits in the resource allocation field of the downlink control information in the active BWP compared to a number of information bits in a resource allocation field for the target BWP.
19. The network node of claim 17 , wherein one of:
the UE is configured for dynamic switching between resource allocation types for the target BWP and the target BWP resource allocation type is preconfigured to a value according to the relationship; and
the UE is configured for dynamic switching between resource allocation types for the target BWP, the target BWP resource allocation type is indicated by a resource allocation type subfield of the resource allocation field in a downlink control information in the target BWP.
20. The network node of claim 17 , wherein one of:
the target BWP is configured for a greater number of resource blocks than the number configured for the active BWP and the number of information bits available in the resource allocation field of the downlink control information in the active BWP is less than a number of information bits available in a resource allocation field in the target BWP and the bits of the resource allocation field are padded; and
the target BWP is used to allocate a smaller number of resource blocks than allocated for the active BWP and the number of information bits in the resource allocation field of the downlink control information in the active BWP is greater than a number of information bits in a resource allocation field in the target BWP and the remaining bits of the resource allocation field are truncated.