Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L5/00—Arrangements affording multiple use of the transmission path
  • H04L5/0091—Signaling for the administration of the divided path
  • H04L5/0094—Indication of how sub-channels of the path are allocated
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L5/00—Arrangements affording multiple use of the transmission path
  • H04L5/0001—Arrangements for dividing the transmission path
  • H04L5/0003—Two-dimensional division
  • H04L5/0005—Time-frequency
  • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
  • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L5/00—Arrangements affording multiple use of the transmission path
  • H04L5/003—Arrangements for allocating sub-channels of the transmission path
  • H04L5/0042—Arrangements for allocating sub-channels of the transmission path intra-user or intra-terminal allocation
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L5/00—Arrangements affording multiple use of the transmission path
  • H04L5/003—Arrangements for allocating sub-channels of the transmission path
  • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload

Definitions

• the present disclosure relates to mobile communication technology, and particularly to a method of configuring a carrier indication field in a downlink control indicator in a wireless communication system.
• CA Carrier Aggregation Enhancement
• RAN#66 a new working item proposal of LTE Carrier Aggregation (CA) Enhancement beyond 5 carriers was approved.
• CA Carrier Aggregation
• RAN4 has also been progressing well lately with the CA requirements specification (especially in downlink direction) with several 3-DL CA work items being completed as well as several 4-DL CA configurations are under discussion.
• CA extension beyond 5 carriers provides an opportunity to efficiently utilize the available spectrum for communication needs.
• a carrier indication filed is configured in the case that cross-carrier scheduling is configured for a carrier aggregation (CA) user equipment (UE).
• the CIF is generally 3-bit field considering that maximum 5 CCs are configured. However, in the new working item which desires to support up to 32 carriers to be aggregated, 3-bit CIF is not enough.
• the inventor of the present invention will consider the enhancement of carrier indication in the uplink/downlink DCI to support cross carrier scheduling among maximum 32 carriers.
• a method of configuring a carrier indication field in a downlink control indicator (DCI) in a wireless communication system wherein a maximum number of carriers supported by the carrier indication field is L, the method comprising:
• the carrier indication field (CIF) in the DCI is configured in detail according to the total supported number L of the carriers, rather than fixing the CIF as 3bits so as to support 8 carriers in maximum.
• the number of L is 32.
• the carrier number supported by the CIF can be extended to 32 more than 5. That is, when there are 32 carriers, anyone of those 32 carriers can be indicated by the CIF in the DCI.
• the compatibility with the current Rel-10 can be realized; on the other hand, the indication for more carriers can be supported.
• N bits occupied by the carrier indication field consist of a first Ni bits and a second N 2 bits, wherein L carriers are divided into at least one group, the number of which is M 1 ; and each of the Mi groups includes no more than M 2 carriers, respectively, the bits of the first Ni bits are used to indicate the group number of the at least one group, the number of which is M l 5 and the bits of the second N 2 bits are used to indicate at least one carrier in the M 2 carriers.
• the group manner, in which each group includes at most 8 carriers, can maximize the usage of each bit, so as to enhance the usage efficiency of each bit. Further, the group manner, in which each group includes at most 5 carriers, can be more compatible with Rel-10, thus the system compatibility can be enhanced.
• M 1 Ceiling(L/5).
• the group manner, in which each group includes at most 8 carriers, can maximize the usage of each bit, so as to enhance the usage efficiency of each bit. Further, the group manner, in which each group includes at most 5 carriers, can be more compatible with Rel-10, thus the system compatibility can be enhanced.
• the rationality of this embodiment is in that cross carrier scheduling usually would not be performed on every carrier, such as on all the 32 carriers, as the complexity is very huge when the cross carrier scheduling is performed on 32 carriers, and as a result the requirement for the calculation ability of the corresponding device would also be enhanced. In most situations, 32 carriers will be grouped at first.
• the standard of the grouping is that the cross carrier scheduling can be performed among different carriers in one group, while the cross carrier scheduling is not supported by the carriers from different groups.
• This kind of configuration can usually satisfy the requirement of the cross carrier scheduling, and would not put higher requirement for the calculation ability for the calculation device.
• the group information of the multiple groups can be transmitted correctly by using high layer signaling (L2 or L3 signaling, for example), that is, the protection scope of the present invention includes high layer signaling (L2 or L3 signaling, for example), not only limited to one specific high layer signaling.
• the cross carrier scheduling is permitted among the carriers within each of the multiple groups, while the cross carrier scheduling is not permitted cross groups.
• L equals to 32.
• the carrier indication field (CIF) in the DCI is configured in detail according to the total supported number L of the carriers, rather than fixing the CIF as 3bits so as to support 8 carriers in maximum.
• the number of L is 32.
• the carrier number supported by the CIF can be extended to 32 more than 5.
• Figure 1 shows a flowchart for a method 100 of configuring the carrier indication field (CIF) in the downlink control information (DCI) in a wireless communication network according to the present invention.
• CIF carrier indication field
• DCI downlink control information
• FIG. 1 shows a flowchart for a method 100 of configuring the carrier indication field (CIF) in the downlink control information (DCI) in a wireless communication network according to the present invention. It is proposed a method 100 of configuring the CIF in the DCI in a wireless communication network, wherein the maximum number of the carrier supported by this CIF is L. The method includes the following steps:
• the CIF in the DCI is configured according to the maximum number L, so as to indicate all the carriers.
• L is an integer larger than 5, and the DCI would be transmitted in a LI signaling.
• cross carrier scheduling is only supported for maximum 5 carriers.
• 3 bits is needed to define the index for each carrier.
• the index of each of the five carriers is defined as 001 , 010, 011, 100 and 101 , respectively.
• the cross carrier scheduling among more than 5 carriers at the same time needs to be supported.
• the carrier indication field (CIF) in the DCI is configured in detail according to the total supported number L of the carriers, rather than fixing the CIF as 3bits so as to support 8 carriers in maximum.
• the number of L is 32.
• the carrier number supported by the CIF can be extended to 32 more than 5. That is, when there are 32 carriers, anyone of those 32 carriers can be indicated by the CIF in the DCI.
• the compatibility with the current Rel-10 can be realized; on the other hand, the indication for more carriers can be supported.
• the N bits occupied by the CIF consist of a first Ni bits and a second N 2 bits, wherein L carriers are divided into at least one group, the number of which is M l 5 and each of the Mi groups includes no more than M 2 carriers, respectively.
• the bits of the first Ni bits are used to indicate the group number of the at least one group, the number of which is M 1 ? and the bits of the second N 2 bits are used to indicate at least one carrier in the M 2 carriers.
• the carriers, the number of which is beyond 5 are not only put in one level (that is in one group) to identify. Instead, at first, L carriers are grouped and the corresponding bits are used to identify the group number.
• each group the carrier indices in each group are described by the corresponding bits in each group.
• the group manner, in which each group includes at most 8 carriers, can maximize the usage of each bit, so as to enhance the usage efficiency of each bit. Further, the group manner, in which each group includes at most 5 carriers, can be more compatible with Rel-10, thus the system compatibility can be enhanced.
• each group manner, in which each group includes at most 8 carriers can maximize the usage of each bit, so as to enhance the usage efficiency of each bit. Further, the group manner, in which each group includes at most 5 carriers, can be more compatible with Rel-10, thus the system compatibility can be enhanced.
• the rationality of this embodiment is in that cross carrier scheduling usually would not be performed on every carrier, such as on all the 32 carriers, as the complexity is very huge when the cross carrier scheduling is performed on 32 carriers, and as a result the requirement for the calculation ability of the corresponding device would also be enhanced. In most situations, 32 carriers will be grouped at first.
• the standard of the grouping is that the cross carrier scheduling can be performed among different carriers in one group, while the cross carrier scheduling is not supported by the carriers from different groups.
• This kind of configuration can usually satisfy the requirement of the cross carrier scheduling, and would not put higher requirement for the calculation ability for the calculation device.
• the group information of the multiple groups can be transmitted correctly by using high layer signaling (L2 or L3 signaling, for example), that is, the protection scope of the present invention includes high layer signaling, not only limited to one specific high layer signaling.
• the cross carrier scheduling is permitted among the carriers within each of the multiple groups, while the cross carrier scheduling is not permitted cross groups.
• L is 32.
• the CIF in the DCI is configured according to the total supported number L of the carriers in detail, rather than fixing the CIF as 3bits so as to support 8 carriers in maximum.
• the number of L is 32.
• the carrier number supported by the CIF can be extended to 32 more than 5. That is, when there are 32 carriers, anyone of those 32 carriers can be indicated by the CIF in the DCI.
• the compatibility with the current Rel-10 can be realized; on the other hand, the indication for more carriers can be supported.
• CA carrier aggregation
• an enhanced CA (CA beyond 5 component carriers) UE can also know the cross carrier scheduling configuration via RRC signaling and know on which carrier's PDCCH to blindly decode its' dedicated UL/DL cross-carrier scheduling DCI.
• an enhanced CA UE with cross carrier configuration only need to search UE-specific search space (USS) on the scheduling carriers, namely the newly defined CIF for beyond 5 carriers and carrier group indication filed (CGIF) only happens in DCI on USS of the scheduling carrier.
• USS search UE-specific search space
• the number of times of blind decoding is 44/32 + 32*numOFScell (where 44/32 times is the blind decoding search times of searching the present cell scheduling DCI in a CSS of a Pcell and a USS/ scheduling carrier USS, and 32 times is the blind decoding search time of searching the scheduled carrier DCI in a USS of a scheduled carrier, and numOFScell is the number of configured cross-carrier scheduled Scells).
• the blind decoding is performed with a new defined DCI for each possible DCI format (1/1A/1B/1C/1D/2/2A/2B/2C/2D), but the number of times of the blind decoding is the same as that deduced for Rel-10 CA.
• both DCI size and the number of times of blind decoding is the same as that defined for Rel-10 CA UE. Therefore, the method according to the present invention basically has no impact on the complexity of blind decoding.
• the increased number of times of blind decoding is mainly caused by the increase of the aggregated carriers supported in CA.

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• Engineering & Computer Science (AREA)
• Signal Processing (AREA)
• Computer Networks & Wireless Communication (AREA)
• Mobile Radio Communication Systems (AREA)

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• 2015
  • 2015-01-30 CN CN201510051222.0A patent/CN105991259B/zh active Active
• 2016
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  • 2016-01-19 WO PCT/IB2016/000256 patent/WO2016120726A1/en active Application Filing

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