WO2014110802A1

WO2014110802A1 - Tdd configuration change for uplink-downlink interference management and traffic adaptation

Info

Publication number: WO2014110802A1
Application number: PCT/CN2013/070705
Authority: WO
Inventors: Wei Hong; Chunyan Gao; Jing HAN; Haiming Wang; Lili Zhang
Original assignee: Broadcom Corp
Current assignee: Broadcom Corp
Priority date: 2013-01-18
Filing date: 2013-01-18
Publication date: 2014-07-24
Anticipated expiration: 2015-07-18

Abstract

In a mobile communication system, a TDD UL-DL configuration of a time division duplex uplink-downlink allocation to be used in the next period of a system information change is coded (S12) in fields of at least one frame relating to a paging message used to inform user equipments about a change of the TDD UL-DL configuration in the next period. The TDD UL-DL configuration is coded in reserved bits of specific fields of a downlink control channel for the paging message, or an information element is added to the paging message, the TDD UL-DL configuration is coded into the information element and an indication is included in the paging message that the information element containing the TDD UL-DL configuration is added.

Description

TDD CONFI GURATI ON CHANGE FOR UPLI NK- DOWN LI NK I NTERFERENCE MANAGEMENT AND TRAFFI C ADAPTATI ON

DESCRIPTION

BACKGROUND OF THE INVENTION

Field of the invention The present invention relates to TDD UL-DL configuration change for

uplink-downlink interference management and traffic adaptation. For example the invention relates to TDD UL-DL configuration change in elMTA.

Related background Art

Prior art which is related to this technical field can e.g. be found in:

[1] TR 36.828 v2.0.0 (2012-06), "Further Enhancements to LTE TDD for DL-UL Interference Management and Traffic Adaptation"

[2] TS 36.331 V10.6.0, June 2012

The following meanings for the abbreviations used in this specification apply: AP Access Point

ASN Abstract Syntax Notation

CRC Cyclic Redundancy Check

DL Downlink

elMTA Enhancements to LTE TDD for DL-UL Interference Management and

Traffic Adaptation

eNB Enhanced Node B

ETWS Earthquake and Tsunami Warning System

IE Information Element

LTE Long Term Evolution

LTE-A Long Term Evolution Advanced P- RNTI Paging Radio Network Temporary Identifier

RRC Radio Resource Control

SIB System Information Block

TDD Time Division Duplex

UE User Equipment

UL Uplink

MAC Media Access Control

Allowing for asymmetric UL-DL allocations is a benefit of deploying a TDD system. The asymmetric resource allocation in LTE TDD is realized by providing seven different semi-statically configured uplink-downlink configurations. These allocations can provide between 40% and 90% DL subframes. In a current LTE deployment, same TDD UL-DL configuration in each cell is assumed, since otherwise interference between UL and DL including both eNB-to-eNB and

UE-to-UE interference needs to be considered. However, in a local area network, due to the small number of active UEs per cell, the traffic situation may fluctuate frequently, and TDD UL-DL reconfiguration to adapt to the traffic is expected to provide improved resource efficiency and power saving. According to Enhancements to LTE TDD for DL-UL Interference Management and Traffic Adaptation (elMTA), a flexible TDD has been agreed, and one issue is to evaluate the gain from traffic adaptation based flexible TDD UL-DL configuration, where each cell can (re)configure independently its TDD UL-DL configuration based on traffic in its own cell. Another issue is to study the additional TDD DL-UL interference mitigation method in multi-cell scenarios.

A still further issue is a specification of a supported time scale together with a necessary signaling mechanism(s) for TDD UL-DL reconfiguration. One method to support different time scales for TDD UL-DL reconfiguration is to use system information signaling. One approach is a Rel-8 system information change procedure and the other approach comprises reusing a Rel-10 ETWS notification procedure according to reference [1]. However, as can be seen from reference [2], after receiving a paging message by a UE, if an ETWS indication is included and the UE is ETWS capable, the UE needs to re-acquire System I nformationBlockTypel (SIB1) immediately, but has to wait until the next system information modification period boundary to get the scheduling information of System I nformationBlockTypel 0 (SIB10)/

System I nformationBlockTypel 1 (SI B11 ) . In other words, after acquiring the ETWS indication from the paging message, the UE still needs extra time and effort to decode the next SIB1 and then to get SIB10/SIB11 to acquire the ETWS information. Thus, if the Rel-10 ETWS notification procedure is re-used to reconfigure a TDD UL-DL configuration, a similar problem as described above will occur.

SUMMARY OF THE I NVENTI ON The present invention aims at providing an efficient way to reconfigure a TDD UL-DL configuration.

This is at least in part achieved by the methods and apparatuses as defined in the appended claims. The invention may also be implemented by a computer program product.

According to at least one exemplary embodiment of the invention, a TDD UL-DL configuration is efficiently informed for the next system information change period using a paging method.

According to at least one exemplary embodiment of the invention, the TDD UL-DL configuration to be changed for el MTA-capable UEs can be indicated in a DCI format for the paging message, or indicated in the paging message itself. In the following the invention will be described by way of exemplary embodiments thereof with reference to the accompanying drawings.

BRI EF DESCRI PTI ON OF THE DRAW I NGS Fig. 1 shows a flowchart illustrating a process 1 of changing a TDD UL-DL configuration according to an exemplary embodiment of the invention.

Fig. 2 shows a flowchart illustrating a process 2 of changing a TDD UL-DL configuration according to an exemplary embodiment of the invention.

Fig. 3 shows a schematic diagram illustrating an exemplary scenario in elMTA.

Fig.4 shows a schematic block diagram illustrating a TDD UL-DL configuration of control units in which examples of embodiments of the invention are

implementable.

DESCRIPTION OF THE EXEMPLARY EMBOD I MENTS In the following exemplary embodiments of the invention will be described.

Fig. 1 shows a flowchart illustrating a process 1 of changing a TDD UL-DL configuration according to an exemplary embodiment of the invention. Process 1 may be executed by an apparatus of a mobile communication system, e.g. an eNB, small cell eNB, etc.

In step S11 of Fig. 1 , a TDD UL-DL configuration of a time division duplex (TDD) uplink-downlink (UL-DL) allocation to be used in the next period of a system information change is generated, and in step S12 the TDD UL-DL configuration is coded in fields of at least one frame relating to a paging message used to inform user equipments (UEs) about a TDD UL-DL configuration change in the next period. Thereafter, the process returns.

According to an exemplary embodiment of the invention, in step S12 the TDD UL-DL configuration is coded in reserved bits of specific fields of a downlink control channel for the paging message.

According to another exemplary embodiment of the invention, in step S12 an information element is added to the paging message and the TDD UL-DL configuration is coded into the information element, and an indication that the information element containing the TDD UL-DL configuration is added is included in the paging message.

Fig. 2 shows a flowchart illustrating a process 2 of changing a TDD UL-DL configuration according to an exemplary embodiment of the invention. Process 2 may be executed by a user equipment in a mobile communication system, such as an el MTA enabled UE.

In step S21 of Fig.2, at least one frame relating to a paging message used to inform user equipments (UEs) about a TDD UL-DL configuration change is acquired, and in step S22 a TDD UL-DL configuration of a time division duplex (TDD)

uplink-downlink (UL-DL) allocation to be used in the next period of a system information change is decoded from fields of the at least one frame relating to the paging message. Thereafter, the process returns.

According to an exemplary embodiment of the invention, in step S22 the TDD UL-DL configuration is decoded from reserved bits of specific fields of a downlink control channel for the paging message. According to another exemplary embodiment of the invention, in step S22 it is checked whether or not an indication of an added information element containing the TDD UL-DL configuration is included in the paging message, and if the indication is included, the TDD UL-DL configuration is decoded from the information element added to the paging message, which contains the TDD UL-DL

configuration.

The TDD UL-DL configuration decoded from the reserved bits of the specific fields of the downlink control channel or from the information element may be prioritized over an allocation TDD UL-DL configuration received from a system information block (SI B), or vice versa.

In case the TDD UL-DL configuration is coded/decoded in/from reserved bits of specific fields of the downlink control channel for the paging message in step S12/S22, according to an exemplary embodiment of the invention, the downlink control channel comprises a DCI Format 1 A CRC scrambled with P-RNTI. For example, as the reserved bits of the specific fields mentioned above, the reserved bits such as HARQ process number (4 bits) and Downlink Assignment Index (2 bits) and the MSB of TPC command (1 bit) are reused to indicate the TDD UL-DL configuration. After receiving this P-RNTI scrambled DCI Format 1A, an

el MTA- enabled UE will try to decode the reserved bits to acquire the new TDD UL-DL configuration used in the next changing period. For example, the HARQ process number and the Downlink Assignment Index can be used to indicate the TDD UL-DL configuration, and the MSB of the TCP command can be used to indicate whether there is a succeeding PDSCH following to save power of the el MTA- enabled UE.

The above TDD UL-DL configuration may comprise a special subframe pattern configuration. However, when elMTA is used in small cells, the special subframe pattern configuration can remain unchanged. Thus, three reserved bits can be used to indicate the TDD UL-DL configuration and one reserved bit can be used to indicate whether there is a succeeding PDSCH following to save the power of the elMTA-enabled UE.

In case the TDD UL-DL configuration is coded/decoded in/from the paging message in step S12/S22, an IE "TDD-Config" is added into the paging message to indicate the next TDD UL-DL configuration. After receiving the paging message, if the I E "TDD-Config" is included and the UE is el MTA capable, the UE will use the TDD UL-DL configuration indicated in "TDD-Config" in the next changing period. The el MTA-enabled UE may either prioritize the "TDD-Config" configured by the paging message over a "TDD-Config" received from an SIB1 or vice versa. Similarly, the el MTA-enabled UE may either prioritize the TDD UL-DL configuration decoded from reserved bits of specific fields of the downlink control channel for the paging message over a "TDD-Config" received from an SIB1 or vice versa.

In the following, implementation examples for the above exemplary embodiments will be described. Fig. 3 shows a schematic diagram illustrating an exemplary scenario in elMTA. The scenario shows a pico eNB 120 of a cell 100 of a mobile communication system. elMTA enabled UEs 110-113 are present in the cell 100, and may receive paging messages from the pico eNB 120. A first implementation example relates to the above-described case that the TDD UL-DL configuration is coded/decoded in/from reserved bits of specific fields of a downlink control channel for the paging message in step S12/S22.

According to the first implementation example, reserved bits in DCI Format 1A scrambled by P-RNTI are used for coding/decoding a TDD UL-DL configuration.

After receiving a PDCCH with DCI Format 1A scrambled by P-RNTI from the pico eNB 120, the el MTA-enabled UEs 110-113 will try to decode "HARQ process number" and "Downlink Assignment Index" bits to acquire a new TDD UL-DL configuration for the next changing period, as shown in Table 1 below. For TDD, the field "HARQ process number" contains 4 bits and the field "Downlink Assignment Index" contains 2 bits. In Table 1 , saO means TDD UL-DL configuration 0, sspO means special subframe pattern 0, sal means TDD UL-DL configuration 1 , sspl means special subframe pattern 1, etc., and UC means Unchanged.

Table 1 : TDD UL-DL configuration for the next changing period

1110 sa4, ssp5 sa5, ssp3 sa6, sspl sa6, ssp8

1111 sa4, ssp6 sa5, ssp4 sa6, ssp2 UC

A second implementation example relates to the above-described case that TDD UL-DL configuration is coded/decoded in/from the paging message in step S12/S22.

According to the second implementation example, an I E "TDD-Config" is added into a paging message to indicate the next TDD UL-DL configuration. After receiving a paging message from the pico eNB 120, the el MTA- enabled UEs 110-113 will check whether an ETWS indication is included in the paging message or not. In case the ETWS indication is included, the el MTA- enabled UEs 110-113 will try to decode Paging-v1200- 1 Es which indicate the new TDD UL-DL

configuration for the next changing period as shown in the modified paging message below. The modification is shown in bold.

Paging message

-- ASN1 START Paging ::= SEQUENCE {

pagingRecordList PagingRecordList OPTIONAL, ~ Need ON

systemlnfoModification ENUMERATED {true} OPTIONAL, -- Need ON etws-lndication ENUMERATED {true} OPTIONAL, - Need ON

nonCriticalExtension Paging-v890-IEs OPTIONAL

}

Paging-v890-IEs ::= SEQUENCE {

lateNonCriticalExtension OCTET STRING OPTIONAL, - Need OP

nonCriticalExtension Paging-v920-IEs OPTIONAL

}

Paging-v920-IEs ::= SEQUENCE {

cmas-lndication-r9 ENUMERATED {true} OPTIONAL, - Need ON

nonCriticalExtension Paging-v1200-IEs OPTIONAL - Need OP

}

Paging-v1200-IEs ::= SEQUENCE { tdd-Config TDD-Config OPTIONAL, -- Cond TDD nonCritical Extension SEQUENCE {} OPTIONAL -- Need OP

PagingRecordList SEQUENCE (SIZE (1..maxPageRec)) OF PagingRecord PagingRecord ::= SEQUENCE {

ue-ldentity PagingUE-ldentity,

cn-Domain ENUMERATED {ps, cs},

PagingUE-ldentity CHOICE {

s-TMSI S-TMSI,

imsi IMSI,

IMSI ::= SEQUENCE (SIZE (6..21)) OF IMSI-Digit

IMSI-Digit ::= INTEGER (0..9)

-- ASN1STOP

Now reference is made to Fig.4 for illustrating a simplified block diagram of various electronic devices that are suitable for use in practicing the exemplary

embodiments of this invention.

A control unit 10, which may be part of and/or used by a UE such as the el MTA-enabled UEs 110-113 of Fig.3, comprises processing circuitry 11 , memory circuitry 12 and interface circuitry 13, which are connected by a connection 14. The memory circuitry 12 may store a program. The interface circuitry 13 comprises a suitable radio frequency (RF) transceiver coupled to one or more antennas (not shown) for bidirectional wireless communications over one or more wireless links 15 with a control unit 20.

The control unit 20, which may be part of and/or used by an eNB such as the pico eNB 120 of Fig. 3, comprises processing circuitry 21, memory circuitry 22 and interface circuitry 23, which are connected by a connection 24. The memory circuitry 22 may store a program. The interface circuitry 23 comprises a suitable radio frequency (RF) transceiver coupled to one or more antennas (not shown) for bidirectional wireless communications over the one or more wireless links 15 with the control unit 10.

The terms "connected," "coupled," or any variant thereof, mean any connection or coupling, either direct or indirect, between two or more elements, and may encompass the presence of one or more intermediate elements between two elements that are "connected" or "coupled" together. The coupling or connection between the elements can be physical, logical, or a combination thereof. As employed herein two elements may be considered to be "connected" or "coupled" together by the use of one or more wires, cables and printed electrical connections, as well as by the use of electromagnetic energy, such as electromagnetic energy having wavelengths in the radio frequency region, the microwave region and the optical (both visible and invisible) region, as non-limiting examples. As used in this application, the term 'circuitry' refers to all of the following:

(a) hardware-only circuit implementations (such as implementations in only analog and/or digital circuitry), and

(b) to combinations of circuits and software (and/or firmware), such as (as applicable): (i) to a combination of processor(s) or (ii) to portions of

processor(s)/software (including digital signal processor(s)) , software, and memory(ies) that work together to cause an apparatus, such as a mobile phone or server, to perform various functions) , and

(c) to circuits, such as a microprocessor(s) or a portion of a m icroprocessor(s) , that require software or firmware for operation, even if the software or firmware is not physically present.

This definition of 'circuitry' applies to all uses of this term in this application, including in any claims. As a further example, as used in this application, the term 'circuitry' would also cover an implementation of merely a processor (or multiple processors) or portion of a processor and its (or their) accompanying software and/or firmware. The term 'circuitry' would also cover, for example and if applicable to the particular claim element, a baseband integrated circuit or applications processor integrated circuit for a mobile phone or a similar integrated circuit in server, a cellular network device, or other network device. At least one of the programs stored in the memory circuitries 12, 22 is assumed to include program instructions that, when executed by the associated processing circuitry enable the electronic device to operate in accordance with the exemplary embodiments of this invention, as detailed above. Inherent in the processing circuitries 11, 21 is a clock to enable synchronism among the various apparatus for transmissions and receptions within the appropriate time intervals and slots required, as the scheduling grants and the granted resources/subframes are time dependent. The interface circuitries 13, 23 include both transmitter and receiver, and inherent in each is a modulator/demodulator commonly known as a modem.

In general, the exemplary embodiments of this invention may be implemented by computer software stored in the memory circuitry 12 and executable by the processing circuitry 11 of the control unit 10 and similar for the other memory circuitry 22 and the processing circuitry 21 of the control unit 20, or by hardware, or by a combination of software and/or firmware and hardware in any or all of the devices shown.

In general, the various embodiments of the control unit 10 can include, but are not limited to, mobile stations, cellular telephones, personal digital assistants (PDAs) having wireless communication capabilities, portable computers having wireless communication capabilities, image capture devices such as digital cameras having wireless communication capabilities, gaming devices having wireless

communication capabilities, music storage and playback appliances having wireless communication capabilities, Internet appliances permitting wireless Internet access and browsing, as well as portable units or terminals that incorporate combinations of such functions.

The memory circuitries 12, 22 may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology, such as semiconductor-based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory. The processing circuitries 11, 21 may be of any type suitable to the local technical environment, and may include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on a multi-core processor architecture, as non-limiting examples. According to an aspect of the invention, an apparatus of a mobile communication system is provided. The apparatus may use and/or include the control unit 20. The apparatus may comprise an eNB such as the pico eNB shown in Fig. 3.

The apparatus comprises means for generating a TDD UL-DL configuration of a time division duplex uplink-downlink allocation to be used in the next period of a system information change, and means for coding the TDD UL-DL configuration in fields of at least one frame relating to a paging message used to inform user equipments about a change of the TDD UL-DL configuration in the next period.

The means for coding the TDD UL-DL configuration in fields of at least one frame may code the TDD UL-DL configuration in reserved bits of specific fields of a downlink control channel for the paging message.

Alternatively, the means for coding the TDD UL-DL configuration in fields of at least one frame may comprise means for adding an information element to the paging message and code the TDD UL-DL configuration into the information element, and comprise means for including, in the paging message, an indication that the information element containing the TDD UL-DL configuration is added.

The specific fields may comprise at least one of a hybrid automatic repeat request process number, a downlink assignment index and a transmit power control command. The TDD UL-DL configuration may comprise a special subframe pattern configuration and/or an indication on a succeeding downlink channel.

The means for generating, coding, adding and including may be implemented by the processing circuitry 21, memory circuitry 22 and interface circuitry 23. According to a further aspect of the invention, a user equipment for use in a mobile communication system is provided. The user equipment may use and/or include the control unit 10. The user equipment may comprise an el MTA- enabled UE 110-113 as shown in Fig. 3. The user equipment comprises means for acquiring at least one frame relating to a paging message used to inform user equipments about a change of a configuration of a time division duplex uplink-downlink allocation to be used in the next period of a system information change, and means for decoding the TDD UL-DL configuration from fields of the at least one frame relating to the paging message.

The means for decoding the TDD UL-DL configuration from fields of at least one frame may decode the TDD UL-DL configuration from reserved bits of specific fields of a downlink control channel for the paging message.

Alternatively, the means for decoding the TDD UL-DL configuration from fields of at least one frame may comprise means for checking whether or not an indication of an added information element containing the TDD UL-DL configuration is included in the paging message, wherein the means for decoding, if the indication is included, decodes the TDD UL-DL configuration from the information element added to the paging message, which contains the TDD UL-DL configuration.

The user equipment may further comprise means for prioritizing the decoded TDD UL-DL configuration over an allocation TDD UL-DL configuration received from a system information block, or vice versa.

The means for acquiring, decoding, checking and prioritizing may be implemented by the processing circuitry 11 , memory circuitry 12 and interface circuitry 13. It is to be understood that the above description is illustrative of the invention and is not to be construed as limiting the invention. Various modifications and applications may occur to those skilled in the art without departing from the true spirit and scope of the invention as defined by the appended claims.

Claims

WHAT I S CLAI MED I S:

1. A method for use by an apparatus of a mobile communication system, the method comprising:

generating a TDD UL-DL configuration of a time division duplex uplink-downlink allocation to be used in the next period of a system information change; and

coding the TDD UL-DL configuration in fields of at least one frame relating to a paging message used to inform user equipments about a change of the TDD UL-DL configuration in the next period.

2. The method of claim 1 , the coding the TDD UL-DL configuration in fields of at least one frame comprising:

coding the TDD UL-DL configuration in reserved bits of specific fields of a downlink control channel for the paging message.

3. The method of claim 1 , the coding the TDD UL-DL configuration in fields of at least one frame comprising:

adding an information element to the paging message and coding the TDD UL-DL configuration into the information element; and

including, in the paging message, an indication that the information element containing the TDD UL-DL configuration is added.

4. A method for use by a user equipment in a mobile communication system, the method comprising:

acquiring at least one frame relating to a paging message used to inform user equipments about a change of a configuration of a time division duplex uplink-downlink allocation to be used in the next period of a system information change; and

decoding the TDD UL-DL configuration from fields of the at least one frame relating to the paging message.

5. The method of claim 4, the decoding the TDD UL-DL configuration from fields of at least one frame comprising:

decoding the TDD UL-DL configuration from reserved bits of specific fields of a downlink control channel for the paging message.

6. The method of claim 4, the decoding the TDD UL-DL configuration from fields of at least one frame comprising:

checking whether or not an indication of an added information element containing the TDD UL-DL configuration is included in the paging message; and if the indication is included, decoding the TDD UL-DL configuration from the information element added to the paging message, which contains the TDD UL-DL configuration.

7. The method of any one of claims 4 to 6, comprising:

prioritizing the decoded TDD UL-DL configuration over an allocation TDD UL-DL configuration received from a system information block, or vice versa.

8. The method of claim 2 or 5, the specific fields comprising at least one of a hybrid automatic repeat request process number, a downlink assignment index and a transmit power control command.

9. The method of any one of claims 1 to 8, the TDD UL-DL configuration comprising a special subframe pattern configuration.

10. The method of any one of claims 1 to 9, the TDD UL-DL configuration comprising an indication on a succeeding downlink channel.

11. A computer program product including a program for a processing device of an apparatus of a mobile communication system, comprising software code portions for performing the steps of any one of claims 1 to 3 and 8 to 10 when dependent on any one of claims 1 to 3, when the program is run on the processing device.

12. A computer program product including a program for a processing device of a user equipment in a mobile communication system, comprising software code portions for performing the steps of any one of claims 4 to 7 and 8 to 10 when dependent on any one of claims 4 to 7, when the program is run on the processing device.

13. The computer program product according to claim 11 or 12, wherein the computer program product comprises a computer-readable medium on which the software code portions are stored.

14. The computer program product according to claim 11 or 12, wherein the program is directly loadable into an internal memory of the processing device.

15. An apparatus of a mobile communication system, the apparatus comprising at least one processor and at least one memory including computer program code, the at least one memory and the computer program code being configured to, with the at least one processor, cause the apparatus at least to perform:

generating a TDD UL-DL configuration of a time division duplex uplink- down I ink allocation to be used in the next period of a system information change; and

16. The apparatus of claim 15, the coding the TDD UL-DL configuration in fields of at least one frame comprising:

17. The apparatus of claim 15, the coding the TDD UL-DL configuration in fields of at least one frame comprising:

adding an information element to the paging message and coding the TDD

UL-DL configuration into the information element; and

18. The apparatus of claim 16, the specific fields comprising at least one of a hybrid automatic repeat request process number, a downlink assignment index and a transmit power control command.

19. The apparatus of any one of claims 15 to 18, the TDD UL-DL configuration comprising a special subframe pattern configuration.

20. The apparatus of any one of claims 15 to 19, the TDD UL-DL configuration comprising an indication on a succeeding downlink channel.

21. A user equipment for use in a mobile communication system, the use equipment comprising at least one processor and at least one memory including computer program code, the at least one memory and the computer program code being configured to, with the at least one processor, cause the user equipment at least to perform:

22. The user equipment of claim 21 , the decoding the TDD UL-DL configuration from fields of at least one frame comprising:

23. The user equipment of claim 21 , the decoding the TDD UL-DL configuration from fields of at least one frame comprising:

24. The user equipment of any one of claims 21 to 23, the at least one memory and the computer program code being configured to, with the at least one processor, cause the user equipment at least to perform:

25. The user equipment of claim 22, the specific fields comprising at least one of a hybrid automatic repeat request process number, a downlink assignment index and a transmit power control command.

26. The user equipment of any one of claims 21 to 25, the TDD UL-DL configuration comprising a special subframe pattern configuration.

27. The user equipment of any one of claims 21 to 26, the TDD UL-DL configuration comprising an indication on a succeeding downlink channel.