Method and device for short PDCCH operation

Abstract

The method and device provide a shortened PDCCH operation. At least one sPDCCH monitoring set may be determined, comprising sPDCCH DL control candidates to be monitored by the device in the sTTI of a subframe (1620). An sPDCCH belonging to one of the at least one sPDCCH monitoring set may be received (1640). The sPDCCH may schedule DL data packet transmissions in the sPDSCH. The sPDCCH may also display a rate matching indicator indicating at least one OFDM symbol. A set of frequency resources may be determined (1650). The sPDSCH may be decoded based on the fact that the sPDSCH is at least rate-matched around a set of frequency resources belonging to at least one OFDM symbol indicated by the rate matching indicator (1660).

Description

Technology Field

[0001] The present disclosure relates to a method and apparatus for short physical downlink control channel (sPDCCH) operation. Background Technology

[0002] Currently, wireless communication devices, such as User Equipment (UE), communicate with other communication devices using wireless signals. In the current 3GPP Long Term Evolution (3GPP LTE), time-frequency resources for UEs are divided into 1 ms subframes, each containing two 0.5 ms slots, and each slot, having a standard CP duration, contains seven Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols in the uplink (UL) time domain and seven Orthogonal Frequency Division Multiplexing (OFDM) symbols in the downlink (DL) time domain. In the frequency domain, resources within the slots are divided into physical resource blocks (PRBs), where each resource block spans 12 consecutive subcarriers.

[0003] In current LTE systems, resources are typically allocated using a 1 ms minimum transmit time interval (TTI) when data is available, which is referred to as dynamic scheduling. Within each scheduled TTI, in the UL, the UE transmits data over the physical uplink shared channel (PUSCH) in PRB pairs indicated by the UL acknowledgment scheduling data transmission to the UE. In the DL, the base station (eNB) transmits data over the physical downlink shared channel (PDSCH) in PRB pairs indicated by the DL acknowledgment / assignment. UL acknowledgment and / or DL ​​assignment information is provided to the UE on a control channel referred to as the PDCCH or enhanced PDCCH ((E)PDCCH). The (E)PDCCH channel carries back control information regarding the data transmitted by the eNB to the UE on the current subframe and information regarding the resources the UE needs to use for uplink data.

[0004] As shown above, there are two types of downlink physical layer control signaling for the purpose of dynamic scheduling: PDCCH and EPDCCH. In the case of PDCCH, control signaling from the eNodeB is received by the User Equipment (UE) in the first one, first two, first three, or first four symbols of a subframe, which are subsequently referred to as control symbols. The remaining symbols within the subframe that follow the control symbols are typically used to receive user data, such as data packets, instead of control signals. User data is received by the UE in selected resource blocks (RBs) of the PDSCH that occupy the entire carrier bandwidth or a portion thereof on the physical downlink shared channel (PDSCH).

[0005] The UE monitors PDCCH candidates for control signaling, where monitoring implies an attempt to decode them. The set of PDCCH candidates to be monitored is defined in terms of search spaces, where the search space at the aggregation level L∈{1,2,4,8} is defined by a set of PDCCH candidates. For each serving cell where a PDCCH is monitored, the search space The control channel elements (CCEs) corresponding to the PDCCH candidates are given by a formula using parameters including the total number of CCEs within the control area of ​​a subframe, derived from the reduction of Physical Control Format Indicator Channel (PCFICH) and Physical Hybrid Automatic Repetition Request (HARQ) Indicator Channel (PHICH) resources; the set level; the number of PDCCH candidates to be monitored in a given search space; and the slot number within the wireless frame.

[0006] The physical control channel is transmitted over a set of one or more consecutive CCEs, where each CCE corresponds to a group of nine resource elements. Each CCE is equivalent to 36 resource elements (REs). One CCE is the minimum PDCCH allocation unit. The number of resource element groups not assigned to a PCFICH or PHICH is N. REG is. The CCEs available in the system range from 0 to N CCE Numbers are assigned up to -1, and here A PDCCH consisting of n consecutive CCEs is It can only start on a CCE that satisfies the condition, where i is the CCE number.

[0007] Another type of downlink physical layer control signaling is EPDCCH. For each serving cell, upper-layer signaling can configure the UE with one or two EPDCCH-PRB sets for EPDCCH monitoring. PRB pairs corresponding to the EPDCCH-PRB sets are indicated by the upper layers. Each EPDCCH-PRB set is from 0 to It includes a set of enhanced CCEs (ECCEs) numbered up to, where, is the number of ECCEs within the EPDCCH-PRB-set p of subframe k. Each EPDCCH-PRB-set can be configured for localized EPDCCH transmission or distributed EPDCCH transmission. For each serving cell, subframes in which the UE monitors EPDCCH UE-specific search spaces are configured by the upper layers. The UE will monitor a set of (E)PDCCH candidates for control information, where monitoring implies attempting to decode each (E)PDCCH decoding candidate within the set according to the monitored DCI formats. The set of (E)PDCCH candidates to be monitored is defined in terms of (E)PDCCH search spaces. Brief explanation of the drawing

[0008] To explain how the advantages and features of the present disclosure may be obtained, the description of the present disclosure is made with reference to specific embodiments of the present disclosure illustrated in the accompanying drawings. These drawings illustrate only exemplary embodiments of the present disclosure and should not be construed as limiting the scope of the present disclosure. The drawings may be simplified for clarification and are not necessarily drawn to actual measurements. FIG. 1 is an exemplary block diagram of a system according to a possible embodiment. FIG. 2 is an exemplary example of sTTI patterns in OFDM symbols per subframe supported for 2-symbol TTI according to a possible embodiment. FIG. 3 is an exemplary example of CRS symbols in a subframe for one antenna port according to a possible embodiment. FIG. 4 is an exemplary example of CRS symbols for two antenna ports according to a possible embodiment. FIGS. 5a and 5b are exemplary examples of CRS symbols for four antenna ports according to possible embodiments. FIG. 6 is an exemplary example showing unused control resources for sPDSCH transmission according to a possible embodiment. FIG. 7 is an exemplary example according to a possible embodiment in which a 2OS-based sTTI UE can be allocated the full bandwidth for sPDSCH and there are two UL approvals for two 0.5 ms-sTTI UEs. FIG. 8 is an exemplary example according to a possible embodiment in which a 2OS-based sTTI UE can be allocated the full bandwidth for sPDSCH and there can be two UL approvals for two 2OS-sTTI UEs. FIG. 9 is an exemplary example according to a possible embodiment in which a 2OS-based sTTI UE can be allocated the full bandwidth for sPDSCH and there are two UL approvals for two 2OS-sTTI UEs and one UL approval for a 0.5 ms-sTTI UE. FIG. 10 is an exemplary example according to a possible embodiment in which a 2OS-based sTTI UE can be allocated the full bandwidth for sPDSCH and there are two UL approvals for two 2OS-sTTI UEs and one UL approval for a 0.5 ms-sTTI UE. FIG. 11 is an exemplary example illustrating a DMRS shared across two consecutive sTTIs for a UE according to a possible embodiment. FIG. 12 is an exemplary example of a UE transmitting DMRS and sPUSCH based on an sTTI index according to a possible embodiment. FIGS. 13a and FIGS. 13b are exemplary examples of a UE determining where to transmit data and DMRS in (a) (2, 2, 3, 2, 2, 3) and (b) (3, 2, 2, 2, 2, 3) UL sTTI layouts based on a scheduled sTTI index according to a possible embodiment. FIG. 14 is an exemplary example of UE interpretation for different UL approval marks for UL DMRS and UL sTTI patterns (2, 2, 3, 2, 2, 3) according to possible embodiments. FIG. 15 is an exemplary example of UE interpretation for different UL approval marks for UL DMRS and UL sTTI patterns (3, 2, 2, 2, 2, 3) according to possible embodiments. FIG. 16 is an exemplary flowchart illustrating the operation of a wireless communication device according to a possible embodiment. FIG. 17 is an exemplary flowchart illustrating the operation of a wireless communication device according to a possible embodiment. FIG. 18 is an exemplary example of a multi-PRB set configuration for sPDCCH monitoring according to a possible embodiment. FIG. 19 is an exemplary example of sPDCCH decoding candidates belonging to different PRB sets according to possible embodiments. FIG. 20 is an exemplary example of sPDCCH monitoring for a UE according to another possible embodiment. FIG. 21 is an exemplary example of sPDCCH decoding candidates belonging to different PRB sets according to other possible embodiments. FIG. 22 is an exemplary block diagram of a device according to a possible embodiment. Specific details for implementing the invention

[0009] The embodiments provide a method and apparatus for sPDCCH operation. According to a possible embodiment, at least one sPDCCH monitoring set may be determined, comprising sPDCCH DL control candidates to be monitored by the device in the sTTI of a subframe. An sPDCCH belonging to one of the at least one sPDCCH monitoring set may be received. The sPDCCH may schedule DL data packet transmissions in the sPDSCH. The sPDCCH may also display a rate matching indicator indicating at least one OFDM symbol. A set of frequency resources may be determined. The sPDSCH may be decoded based on the fact that the sPDSCH is at least rate-matched around a set of frequency resources belonging to at least one OFDM symbol indicated by the rate matching indicator.

[0010] According to another possible embodiment, at least one sPDCCH monitoring set including sPDCCH DL control candidates to be monitored by the device in the sTTI of a subframe may be displayed to the device. An sPDCCH belonging to one of the at least one sPDCCH monitoring set may be transmitted to the device. The sPDCCH may schedule DL data packet transmissions in the sPDSCH. The sPDCCH may also display a rate matching indicator displaying at least one OFDM symbol. The sPDSCH may be transmitted with at least rate matching around a set of frequency resources belonging to at least one OFDM symbol displayed by the rate matching indicator.

[0011] FIG. 1 is an exemplary block diagram of a system (100) according to a possible embodiment. The system (100) may include at least one wireless communication device (110), such as a user equipment (UE), at least one base station (120), such as an enhanced NodeB (eNB) and / or access point, and a network (130). The wireless communication device (110) may be a wireless terminal, a portable wireless communication device, a smartphone, a cellular telephone, a flip phone, a personal information terminal, a personal computer, an optional call receiver, a tablet computer, a laptop computer, or any other device capable of transmitting and receiving communication signals over a wireless network.

[0012] The network (130) may include any type of network capable of transmitting and receiving wireless communication signals. For example, the network (130) may include a wireless communication network, a cellular telephone network, a time division multiple access (TDMA)-based network, a code division multiple access (CDMA)-based network, an orthogonal frequency division multiple access (OFDMA)-based network, a Long Term Evolution (LTE) network, a 3rd Generation Partnership Project (3GPP)-based network, a satellite communication network, a high-altitude platform network, the Internet, and / or other communication networks.

[0013] To reduce the latency of communication in a system (100) such as an LTE system, shorter minimum TTIs (sTTIs), such as shorter than 1 ms, may be used in UL / DL. Using sTTIs enables the UE to transmit / receive data with reduced latency compared to current LTE systems. Furthermore, acknowledging a group or each of several sTTIs, which leads to a faster acknowledgment of data compared to using a 1 ms TTI to acknowledge data, may be helpful in some applications, such as Transmission Control Protocol (TCP) during slow start intervals for users in good channel conditions. For example, in a TCP slow start interval for DL ​​communication, the network-UE link capacity for a user in good channel conditions may support more data, but the network transmits less data because the network waits to receive an acknowledgment for previously transmitted data due to the TCP slow start interval. Therefore, faster acknowledgments, such as the result of using shorter TTI lengths, can help the network better utilize available network-UE link capacity.

[0014] For example, scheduling a UE transmission with an sTTI length of 0.5 ms, such as sPUSCH scheduled using a PRB spanning 0.5 ms in a 1 ms subframe, or scheduling a UE transmission with an sTTI length of ~140 ms, such as sPUSCH scheduled using a shortened PRB spanning two SC-FDMA symbols within a slot in a subframe, will not only reduce the time required to start and end the transmission of a data packet, but will also potentially reduce the round-trip time for possible HARQ retransmissions associated with that data packet.

[0015] 'Subframe' may refer to a time domain container spanning a fixed number of OFDM symbols, such as a 1 ms subframe duration for a numerology with a 15 kHz subcarrier spacing. For a numerology with a kHz subcarrier interval, m can be a scaling factor with m∈{-2, 0, 1, ..., 5}, and the subframe duration is 1 / 2 mIt may be in milliseconds. "TTI" typically refers to the duration during which a UE can receive / transmit transmission blocks (TBs) from upper layers (i.e., MAC protocol data units (PDUs) from the Media Access Control (MAC) layer). Thus, the TTI length may depend on how TBs are mapped to REs and OFDM symbols. The TTI may include resources for control channels that can be used for resource allocation within the TTI for the UE. The physical layer may provide information delivery services to the transmission channels of the MAC and upper layers, such as the downlink shared channel (DL-SCH) and uplink shared channel (UL-SCH), which may be characterized by support for HARQ, dynamic link adaptation by changing modulation, coding and transmit power, dynamic and semi-static resource allocation, and the possibility of using beamforming. The DL-SCH and UL-SCH transmission channels of the subframe length TTI can be mapped to physical channels PDSCH and PUSCH, which have associated control channels such as PDCCH and PUCCH. PDCCH can inform the UE of, at least, resource allocation / assignment and hybrid ARQ information of the subframe length TTI DL-SCH, and uplink scheduling acknowledgment and hybrid ARQ information of the subframe length TTI UL-SCH. PUCCH can return hybrid ARQ ACK / NAKs in response to the subframe length TTI downlink transmission, and can return scheduling requests (SR) and CSI reports. Through the physical layer, the subframe length TTI DL and UL transmissions can use subframes having multiple OFDM / SC-FDMA symbols (e.g., 14 symbols in a 15 kHz subcarrier interval numerology with a 1 ms subframe duration).The PDCCH channel can return control information regarding data being transmitted on the current subframe and information regarding resources that the UE needs to use for uplink data. This means that if the UE wants to transmit some data or receive something, it may be essential for the UE to successfully decode it.

[0016] Short TTI (sTTI) can provide support for TTI lengths shorter than subframe length DL-SCH and UL-SCH. Short TTI DL-SCH and UL-SCH transmission channels can be mapped to physical channels, short PDSCH (sPDSCH) and short PUSCH (sPUSCH), which have associated control channels, short PDCCH (sPDCCH) and short PUCCH (sPUCCH). sPDCCH can inform the UE of at least, resource allocation / assignment and hybrid ARQ information for 1 ms TTI DL-SCH, uplink scheduling acknowledgment and hybrid ARQ information related to short TTI (TTI length shorter than subframe length) DL-SCH, and uplink scheduling acknowledgment and hybrid ARQ information related to short TTI (TTI length shorter than subframe length) UL-SCH. sPUCCH can return hybrid ARQ ACK / NAKs in response to a short TTI downlink transmission, and can return a scheduling request (SR) and possibly CSI reports. sPDCCH and sPUCCH can be transmitted for a duration shorter than the subframe length.

[0017] Through the physical layer, short TTI DL and UL transmits may use slots or subslots (e.g., 7 symbol slots, 2 or 3 symbol subslots in 15 kHz subcarrier spacing numerology) that may be part of a subframe having multiple OFDM / SC-FDMA symbols, which is fewer than the number of symbols in the subframe (e.g., 14 symbols). For reduced latency, a shortened PDCCH (sPDCCH) may be defined to perform a similar role in sTTI or a group of sTTIs. For a PDCCH, resource allocation may occur in terms of CCEs equivalent to 36 REs. One CCE is the minimum PDCCH allocation unit. For an sPDCCH, the sPDCCH may be formed by a set of one or more short control channel elements (sCCEs), and each sCCE may contain a set of resource elements such as 48 REs or 72 REs. One sCCE can be at least an sPDCCH allocation unit.

[0018] For example, a CCE may include nine resource element groups (REGs), and each REG may include four consecutive REs of RBs excluding REs belonging to cell-specific reference signals (CRSs). The REGs forming the CCE may be distributed across the PDCCH control region (i.e., PDCCH symbols in time and system BW in frequency) through an interleaving formula. An sCCE may include fewer REGs than the nine REGs of a legacy CCE. In particular, an sCCE may include six sREGs for a DMRS-based sPDCCH in a 3-symbol sTTI and four sREGs in a different way (i.e., for a CRS-based sPDCCH in a 2-symbol or 4-symbol sTTI and for a DMRS-based sPDCCH in a 2-symbol sTTI). Each sREG may contain one RB within one OFDM symbol containing REs for CRS and / or DMRS, wherein the reference symbol for decoding DMRS-based sPDCCH is a DMRS reference signal; the reference symbol for decoding CRS-based sPDCCH is a CRS reference signal; and the sREGs are distributed in time to sPDCCH symbols and in frequency to sPDCCH RB sets according to different interleaving formulas.

[0019] As the sTTI length becomes shorter, control overhead may increase, which can ultimately increase complexity and consequently processing delay, which can negatively affect the latency reduction provided by low-latency operation. To reduce control signal overhead, several general approaches are possible.

[0020] According to the first approach, multiple sTTIs may be scheduled via a single acknowledgment that can be transmitted via an sPDCCH or (E)PDCCH command, which may be referred to as multi-sTTI scheduling. According to the second approach, control information may be transmitted in a hierarchical manner, for example, to more than one stage. For example, a first stage, also referred to as "slow DCI," may provide a subset of control information common to a set of sTTIs at a first time moment, and a second stage, also referred to as "fast DCI," may provide complementary control information related to each sTTI at a second time moment. The first stage may include resource / search space information for the second stage control information. According to the third approach, control information may be transmitted in each scheduled sTTI, but some DCI bit fields are reduced compared to DCIs used in legacy 1 ms-TTI. For example, in the case of a 2-symbol sTTI, the RGB size can be larger than that used for the legacy 1 ms-TTI, for instance, it can be six times larger.

[0021] FIG. 2 is an exemplary example (200) of sTTI patterns in OFDM symbols per subframe supported for 2-symbol TTI according to a possible embodiment. The UE can determine which DL sTTI pattern to use based on the Control Format Indicator (CFI) value indicated by PCFICH in the case of self-carrier scheduled component carriers, e.g., based on the PDCCH length to the number of OFDM symbols, and in the case of cross-carrier scheduled component carriers, via Radio Resource Control (RRC) signaling. CRS-based and Demodulation Reference Signal (DMRS)-based sPDCCHs may be supported.

[0022] FIG. 3 is an exemplary example (300) of CRS symbols (R0) in a subframe for one antenna port according to a possible embodiment. FIG. 4 is an exemplary example (400) of CRS symbols (R0 and R1) for two antenna ports according to a possible embodiment. FIG. 5a and FIG. 5b are exemplary examples (500) of CRS symbols (R0, R1, R2, and R3) for four antenna ports according to a possible embodiment. For CRS-based sPDCCH, frequency diversity may be important, so it may be desirable to distribute sPDCCH resources across frequency rather than time. To achieve better latency reduction, sPDCCH may be transmitted in the first symbol of sTTI and thus processed faster. CRS symbols may be located in specific OFDM symbols within a subframe. For example, in the case of a two-antenna port CRS in example (400), the symbols (0, 4, 7, and 11) include a CRS, and in the case of a four-antenna port CRS in example (500), the symbols (0, 1, 4, 7, 8, and 11) include a CRS.

[0023] Therefore, in the case of a CRS-based sPDCCH, the number of symbols included in the sPDCCH may vary depending on the position of the CRS symbol relative to the sTTI. For example, considering two CRS antenna ports, in the case of DL sTTI pattern 1, for sTTI index 1, the CRS symbol may be located at the end of the sTTI, and the previous CRS may be located at the first symbol of sTTI 0, for example, three symbols before the start of sTTI index 1. Therefore, in order to use the CRS at the second symbol of sTTI index 1, for example, OFDM symbol 4, it may be useful to have an sPDCCH that occupies two symbols instead of one symbol in that sTTI.

[0024] According to a possible embodiment, the number of symbols within the sTTI containing sPDCCH for a UE can be determined based on the DL sTTI pattern and sTTI index within the subframe. This embodiment may be useful when the UE was not scheduled in previous subframes. In such a case, the CRS filtering performance for estimating channel quality may be somewhat inaccurate because, possibly excluding the first CRS within the subframe for PDCCH monitoring, not many CRS-containing symbols are available for filtering. For example, if the temporal variation of the channel is significant, having recent CRS-containing symbols can significantly improve the channel estimation quality. For example, the following is an example of the number of sPDCCH symbols for a UE.

[0025]

[0026]

[0027] In the tables above, the "x" and "y" values ​​can be fixed as x= 1, y= 1 in the specifications, configured through upper layer signaling, such as RRC or Media Access Control-Control Element (MAC-CE) signaling, or indicated through physical layer signaling, such as slow DCI at the beginning of a subframe. However, physical layer indication may or may not be as efficient as the other methods mentioned above, because in the case of a false detection of slow DCI, the fast DCI may not be decodingable.

[0028] One possible exemplary option may also be to indicate, via higher-layer signaling, such as RRC or MAC-CE, or via physical layer signaling, such as slow DCI (although higher-layer signaling may be preferable), whether the sPDCCH occupies 1 symbol for all sTTIs in the subframe; 2 symbols for all sTTIs in the subframe; or 1 symbol for some sTTIs and 2 symbols for other sTTIs in the subframe. For example, in the case of a 2-CRS antenna port configuration, for DL ​​sTTI pattern 1, all sTTIs in the subframe may have a CRS-based sPDCCH that occupies 1 symbol, except for sTTI index 1, where the sPDCCH can occupies 2 symbols.

[0029] In the time domain, sPDCCH candidates can occupy one or two symbols in all sTTIs of a subframe, where two sTTIs can allow up to three symbols. For example, to potentially improve latency and frequency diversity, it may be possible to have a CRS-based sPDCCH occupy only the first symbol of an sTTI. However, having two OFDM symbols for both DMRS-based and CRS-based sPDCCHs can simplify the design and facilitate simultaneous scheduling using multiple high set levels. For example, in an sTTI containing two CRS ports in the first symbol of the sTTI, two UL acceptances with an assembly level (AL) = 8 may require ~72 RBs when the sPDCCHs span only one symbol, whereas only ~30 RBs may be required when the sPDCCHs span two symbols. For sPDCCH candidates with AL = 2 or higher AL in the sTTI, the frequency diversity gain using one symbol may be smaller compared to using two symbols. Furthermore, based on the position of the CRS symbols in the sTTI, the initial sPDCCH decoding gain may not always be achievable.

[0030] Consider the sPDCCH for sTTI index 1 as illustrated in example (200), based on DL sTTI pattern 1 and assuming two CRS antenna ports. Due to poor sPDCCH decoding performance, the initial decoding benefit of having an sPDCCH spanning only the first symbol of sTTI may not be achievable. For example, if the UE is not scheduled in previous subframes due to discontinuous reception (DRX), the CRS filtering performance for estimating channel quality may be somewhat inaccurate, because only the already available CRS symbols may be located in the first symbol of sTTI 0, e.g., three symbols prior to the start of sTTI index 1. In such a scenario, it may be useful to include the CRS in the second symbol of sTTI index 1, e.g. OFDM symbol 4, for sPDCCH demodulation. At that time, the benefits of using one symbol for sPDCCH compared to using two symbols can become clear, such as how much frequency diversity gain is more important than the benefits of using two symbols for sPDCCH. Similarly, for sTTI 0 in both DL sTTI patterns, if sPDCCH uses four CRS antenna ports for transmit diversity, it may be beneficial for sPDCCH to span two symbols.

[0031] FIG. 6 is an exemplary example (600) showing unused control resources for sPDSCH transmission according to a possible embodiment, wherein the frequency follows the x-axis. The sPDSCH rate matching information field within the DL stage 1 acknowledgment may be sized to 3 bits to provide 8 locations within the sPDCCH area for identifying the start of UL acknowledgments within the control area. In the example (600), an example of 8 locations within the sPDCCH control area mapped to the start of UL control acknowledgments corresponding to different set levels is illustrated. For this example, 3 UL acknowledgments may be assigned to 3 distinct users, and a first acknowledgment placement is made for user C. In User B's DL acknowledgment, the sPDSCH rate matching information field may be filled with a value of 5, which may inform User B that the portion of the control zone from the end User B's DL acknowledgment to the beginning of the placement marker "5" within the control zone will be used for sPDSCH data transmission.

[0032] In sTTI, the eNB may not use all sPDCCH candidates to schedule sTTI transmissions. In such cases, unused control resources may be utilized, for example, to transmit DL data on the sPDSCH. For example, the eNB may quantize the control region and indicate to the sTTI UE in sTTI how many of the control resources are available or unavailable for a DL sTTI transmission. Example (600) illustrates an example in which UE B obtains its DL acknowledgment in sTTI and, based on the indication in the DL acknowledgment, can determine which part of the sPDCCH control region is free for the eNB to schedule UE B for the sPDSCH. As an example, the eNB may indicate to the UE that its DL sPDSCH is scheduled on the entire available bandwidth of the sTTI containing two OFDM symbols. However, since some REs can be assigned to approvals such as UL approvals, for other UEs, eNB can display index 5 in example (600), which means that the rest of the control resources can be used after approval for UE C.

[0033] According to another possible embodiment, unused control resources of different TTI lengths may be indicated to the sTTI UE. Assuming that in a cell there are 1 ms-TTI UEs, 0.5 ms-sTTI UEs, and 2-symbol (2OS)-based sTTI UEs, one question is how unused control resources configured / assigned for sPDCCH candidates for 0.5 ms-sTTI UEs at sTTI index 3 and possibly sTTI index 4 and PDCCH candidates at sTTI index 0 to be used for their sPDSCH transmission can be indicated to UE B configured for 2OS-based DL sTTI transmission, for example, for the DL sTTI pattern 1 shown in example (200).

[0034] According to a possible embodiment, for PDCCH candidates in sTTI 0, since UE B can know the length of the PDCCH control area, for example, through the control format indicator (CFI) value, the eNB can quantize the PDCCH area and indicate which resources are available for sPDSCH transmission to the UE, similar to the method of example (600). Unlike example (600), the quantization of the PDCCH area may differ, for example, based on a fraction of the bandwidth, rather than based on PDCCH CCEs. For example, the eNB can indicate a fraction from a set of fractions {1, 1 / 2, 1 / 4, 1 / 8} available for sPDSCH from the beginning of the frequency area, or alternatively, indicate whether the first half, the last half, the first 1 / 2, the second 1 / 4, etc. are available. Note that since UE B knows the length of the PDCCH region by the number of OFDM symbols, which may differ from the length of the sPDCCHs for 2OS, UE B can understand which REs are available.

[0035] According to another possible embodiment, for sTTI 3, it is assumed that UE B knows that its sPDCCH occupies only OFDM symbol index 7. If there exists a UE D configured for 0.5 ms-sTTI DL sTTI operation, and its sPDCCH resources may overlap at frequency with the sPDCCH allocation of UE B, which may have a different number of OFDM symbols, for example, if the sPDCCH for 0.5 ms-sTTI UE D takes two OFDM symbols, namely OFDM symbol indexes 7 and 8 within a subframe, then to indicate unused sPDCCH for UE B, the eNB may also indicate to UE B the length of the 0.5 ms-sPDCCH(s) in the symbols. In this way, UE B can know whether the REs in both symbols are available for reuse for the sPDCCH or whether only the REs in the second symbol are available.

[0036] For example, in example (600), when the eNB displays index 5 to the UE B when there is no 0.5 ms-sPDCCH and all 2OS sPDCCHs take only symbol index 7, the UE B will know that a fraction of the bandwidth is available for the sPDCCH in symbol 7 and all bandwidth is available in symbol 8 based on index 5. For the case where the 0.5 ms-sPDCCH takes two OFDM symbols, displaying index 5 to the UE B may mean that only a fraction of the resources are available in both symbols 7 and 8. Optionally, as illustrated in example (600), there may be a field within the UE B's DL approval indicating the number / index of OFDM symbols referenced by a rate-matching frequency index, such as a frequency availability index.

[0037] FIG. 7 is an exemplary example (700) according to a possible embodiment in which a 2OS-based sTTI UE B can be allocated the full bandwidth for sPDSCH and there are two UL approvals for two 0.5 ms-sTTI UEs, such as UE D and UE F. UE B may also be marked with OFDM symbols of rate matching time index = 2.

[0038] FIG. 8 is an exemplary example (800) according to a possible embodiment in which a 2OS-based sTTI UE B may be allocated the full bandwidth for sPDSCH and there may be two UL approvals for two 2OS-sTTI UEs, such as UE A and UE C. UE B may also be marked with an OFDM symbol of rate matching time index = 1.

[0039] FIG. 9 is an exemplary example (900) according to a possible embodiment in which a 2OS-based sTTI UE B can be allocated the full bandwidth for sPDSCH and there are two UL acknowledgments for two 2OS-sTTI UEs, such as UE A and UE C, and one UL acknowledgment for a 0.5 ms-sTTI UE D. UE B may also be marked with OFDM symbols of rate matching time index = 1 for the 2OS-sTTI UE acknowledgments and OFDM symbols of rate matching time index = 2 for the 0.5 ms-sTTI UE acknowledgments. According to a possible implementation, at the cost of additional bits in the DL acknowledgments of UE B, the eNB may mark more detailed rate matching information as shown in the example (900).

[0040] FIG. 10 is an exemplary example (1000) according to a possible embodiment in which a 2OS-based sTTI UE B may be allocated the full bandwidth for sPDSCH, and there are two UL acceptances for two 2OS-sTTI UEs, such as UE A and UE C, and one UL acceptance for a 0.5 ms-sTTI UE D. UE B may also be marked with OFDM symbols of rate-matching time index = 1 for the 2OS-sTTI UE acceptances and OFDM symbols of rate-matching time index = 1 for the 0.5 ms-sTTI UE acceptances. The UL acceptance for UE D may include three OFDM symbols that essentially occupy sTTI indices 3 and 4, from example (200). A 0.5 ms sTTI UE may have three OFDM symbol lengths, and in this case, it may span two 2OS-based sTTIs as illustrated in Example (1000). Alternatively, the eNB may perform entirely Frequency Division Multiplexing (FDM) 2OS and 0.5 ms sTTI operations. However, this may or may not be a good practice for the example provided in Example (700), as in some cases, and there may be no way for the eNB to know in advance of the presence of UL data.

[0041] FIG. 11 is an exemplary example (1100) illustrating a DMRS shared across two consecutive sTTIs for a UE, such as UE A, according to a possible embodiment. The DMRS allocation at frequency may be similar to their sPUSCH allocations in both sTTIs. In the case of 2OS sTTIs, the UL sTTI pattern for sPUSCH may be down-selected between the following patterns: (2, 2, 3, 2, 2, 3) and (3, 2, 2, 2, 2, 3). Each number may indicate the length of the sTTI of the subframe as the number of OFDM symbols. Additionally, the data symbol(s) for sPUSCH may be limited within the sTTI. Additionally, when sPUSCH is transmitted, the number of symbols available for data transmission within the sTTI may be one or two for an sTTI with two symbols, and one, two, or three for an sTTI with three symbols. Additionally, if present, the presence and location of the UL DMRS may be given or determined by UL approval. The UL DMRS may be located before or within the associated sTTI. Additionally, the UL DMRS may be located after the associated sTTI. Different methods may be used for the UE to determine the location of the UL DMRS. For the UE to share DMRS symbols between two consecutive sTTIs, the sPUSCH allocation in the frequency domain in any one of the scheduled sTTIs may be identical or similar to that of the DMRS as illustrated in Example (1100).

[0042] FIG. 12 is an exemplary example (1200) of a UE transmitting DMRS and sPUSCH based on an sTTI index according to a possible embodiment. FIG. 13a and FIG. 13b are exemplary examples (1300 and 1302) of a UE determining where to transmit data and DMRS in (a) (2, 2, 3, 2, 2, 3) and (b) (3, 2, 2, 2, 2, 3) UL sTTI layouts based on a scheduled sTTI index according to a possible embodiment. "D" may represent sPUSCH, and "R" may represent DMRS. The UE may determine the UL DMRS location based on the sTTI index within the subframe. Example (1200) illustrates a UL sTTI pattern consisting of sTTIs of 2, 2, 3, 2, 2, and 3 OFDM symbols, represented as (2, 2, 3, 2, 2, 3). When a UE is scheduled for UL sPUSCH transmission at an sTTI in the UL sTTI layout (2, 2, 3, 2, 2, 3), the UE can transmit DMRS and sPUSCH based on the sTTI index. For example, when a UE is scheduled for transmission at sTTI0, the UE can transmit sPUSCH at the first symbol of sTTI0 and the associated DMRS at the second symbol of sTTI0; When a UE is scheduled to transmit sPUSCH on sTTI1, the UE may transmit DMRS at the last symbol of the previous sTTI, such as the last symbol of sTTI0, and may transmit sPUSCH at both symbols of sTTI1.

[0043] These patterns may not provide any inter-subframe scheduling dependencies. When sTTI0 is scheduled in subframe n, it may include DMRS and may not need to use DMRS in the previous subframe n-1, which can provide more flexibility in scheduling PUSCH and sPUSCH across different subframes. For example, most RBs in subframe n-1 may have been used by PUSCH of another UE, whereas no PUSCH may have been scheduled for any UE in subframe n. Therefore, the sTTI UE can flexibly receive any RBs within sTTI0 of the current subframe for UL transmission.

[0044] These patterns may also not provide any inter-slot scheduling dependencies. When sTTI3 is scheduled, it may include DMRS, and there is no need to use DMRS in the previous slot, which can provide more flexibility in scheduling 0.5 ms sPUSCH UEs and 2OS-based sPUSCH UEs across different slots of the subframe. For example, most RBs in the first slot may have been used by another UE's 0.5 ms-sPUSCH, whereas no 0.5 ms-sPUSCH may have been scheduled in the second slot for any UE. Thus, a 2OS-based sTTI UE can flexibly be assigned any RBs within sTTI3 for UL transmission.

[0045] Additionally, these patterns cannot provide any DMRS after sTTI. In the case of sTTI, DMRS can always be before or within sTTI rather than after sTTI, which can reduce latency. These patterns can additionally provide minimal UL approval overhead. No bits may be required in the UL approval to indicate which symbols should be used for DMRS and sPUSCH.

[0046] Reference symbols shared across two sTTIs can be Frequency Division Multiplexed (FDM) between the two sTTIs. Optionally, signaling can be used to modify the pattern for each individual sTTI location. For example, for sTTI0: DR, RD. If no subsequent sTTI exists, it may be better to use the RD pattern to improve latency. For sTTI1: DD, RD. If no subsequent sTTI exists, RD may be used; otherwise, DD may be used. It may also be possible to always perform RDD through pilot FDM sharing. For sTTI2: RDD, DDD.

[0047] According to another possible embodiment, an index for UL DMRS locations may be indicated by sPDCCH in each sTTI. The UE may determine UL DMRS locations based on the indicated index and based on at least the UL sTTI pattern and / or sTTI index within the subframe.

[0048] According to a possible implementation, the eNB may also configure a parameter indicating the average number of reference symbols per subframe for sTTI operations, such as 2OS sTTI, by indicating it in, for example, slow DCI or fast DCI, or through a higher layer such as RRC or MAC-CE. The UE may then determine the UL DMRS location based on one or more of the UL sTTI pattern and sTTI index within the subframe, based on the indicated index, for example, a parameter for the furthest reference symbol outside that sTTI to be used for the sTTI. The parameter may be selected based on the temporal variation of the channel. For example, if the channel does not change rapidly, the parameter may be set to a large value such as 2 or 4, otherwise, a smaller value such as 1 may be appropriate. The parameter may also be fixed to, for example, 1 in the specifications.

[0049] FIG. 14 is an exemplary example (1400) of UE interpretation for different UL approval marks for UL DMRS and UL sTTI patterns (2, 2, 3, 2, 2, 3) according to a possible embodiment. FIG. 15 is an exemplary example (1500) of UE interpretation for different UL approval marks for UL DMRS and UL sTTI patterns (3, 2, 2, 2, 2, 3) according to a possible embodiment. According to a possible implementation, the UL approval may include a 1 bit referred to as "b" here to indicate the UL DMRS location. For example, the UE may determine the UL DMRS location according to the following mapping table 3, where the furthest reference symbol outside the sTTI to be used for the sTTI parameter may be set to 1. For example, referred to as "Rs" in examples (1200 and 1300).

[0050]

[0051]

[0052] For example, it is possible to allow various distributions of sPUSCH and DMRS in the time domain through upper-layer signaling, which can provide more flexibility. For example, a single bit in the UL acceptance can indicate two possibilities for each sTTI, as illustrated in Tables 5 and 6, for the (2, 2, 3, 2, 2, 3) and (3, 2, 2, 2, 2, 3) UL sTTI layouts, respectively. Note that these patterns also take into account inter-subframe / inter-slot scheduling independence and that no DMRS can be used after a scheduled sTTI.

[0053]

[0054]

[0055] Given the simplicity of the structures illustrated in example (200), which do not require representation / configuration of the sPUSCH and DMRS distributions in the time domain, those structures can be used as baselines. According to a possible implementation, for individually scheduled UL sTTIs, the UE can determine where to transmit the UL DMRS and sPUSCH based on the scheduled sTTI index. For example, in the case of (2, 2, 3, 2, 2, 3), the (DRDDRDD, DRDDRDD) pattern may be used. In the case of (3, 2, 2, 2, 2, 3), the (DDRDDRD, DRDDRDD) pattern may be used. No time domain representation of the UL DMRS can serve as a baseline for analysis.

[0056] For sPDCCH monitoring, the set levels (ALs) of sPDCCH monitoring candidates may be sTTI BW dependent. In small BWs, only small ALs may be allowed. Additionally, for the first sTTIs of a subframe, e.g., the sTTIs of the first slot, the sPDCCH monitoring sets may not be determined via slow DCI, e.g., to avoid first-level DCI decoding delay. The first sTTIs of a subframe may have fewer sPDCCH monitoring candidates, e.g., to accommodate PDCCH blind decodes. Slow DCI may modify the sPDCCH monitoring sets for the remainder of the sTTIs.

[0057] Regarding the number of blind decodes (BDs) based on agreed DL sTTI patterns, there may be 6 sTTIs in a subframe. It is noted that since sPDCCH BDs occur at different sTTIs, not all of them need to be processed simultaneously, and it may be feasible to support additional BDs per subframe than is generally assumed for LTE, which may be similar to doubling the number of BDs per subframe supported for the initial part of the LAA subframe. For example, assuming that 44 PDCCH BDs can be processed up to the end of the first slot of the subframe, such as in the first two OFDM symbols of the subframe, the hardware may reuse up to 44 BDs for sPDCCH decoding in the second slot of the subframe. However, to accommodate blind decoding for sPDCCH decoding candidates belonging to the sTTIs of the first slot, the number of PDCCH BD attempts can be reduced from 44 to, for example, 32, which allows 12 BD attempts for the first 3 sTTIs of the subframe. Assuming that 2 DCI formats are monitored, this leaves each sTTI of the sTTIs of the first slot as 2 sPDCCH decoding candidates.

[0058] Therefore, assuming that PDCCH blind decoding is completed by the end of the first slot of each subframe of 44 BDs, it may be feasible for the UE to perform more than 44 BDs per subframe, such as 32 BDs for PDCCH and 56 BDs for sPDCCH candidates. Additionally, to balance the UE BDs for PDCCH and sPDCCH, the sTTIs of the first slot of the subframe may have fewer BDs, such as 4 BDs / sTTI, compared to the sTTIs of the second slot of the subframe, such as 14 BDs / sTTI. If the UE is configured with DL 2OS-based sTTIs, the number of PDCCH BDs may be reduced, and the sTTIs of the first slot may have fewer sPDCCH monitoring candidates.

[0059] For the set levels (ALs) of sPDCCH, assuming 36 RE / CCEs similar to PDCCH in sTTI containing 2 OFDM symbols without any reference symbol overhead such as 24 RE / RBs, AL 8 may require 12 RBs, which is an overhead of more than 20% in, for example, a 50RB system. Therefore, ALs higher than 8 may not be supported for 2OS-sTTI. Thus, assuming a CCE size of 36 REs for sPDCCH, ALs not higher than 8 may be supported for 2OS-based sTTIs.

[0060] Based on the above analysis of the number of BDs, assuming that two DCI formats are monitored, between two and seven sPDCCH candidates can be monitored in each sTTI. Since candidates with different set levels can be monitored in a subframe, every individual UE, when configured for sTTI operation, can benefit from latency reduction to some extent. Table 7 illustrates examples of possible set levels for sTTI as a function of the number of sPDCCH candidates monitored in sTTI. Note that higher ALs, such as 4 and 8, may not be monitored in all sTTIs of a subframe. For example, every odd sTTI may have a candidate with AL = 4, and every even sTTI may have a candidate with AL = 8. In this way, more candidates with lower ALs, such as 1 and 2, can be monitored in sTTI.

[0061]

[0062] Therefore, in a subframe, all supported set levels can be monitored, and different sTTIs of the subframe can support different sets of set levels. Certain sTTIs can enable a single transmit mode (TM) to allow more set levels.

[0063] FIG. 16 is an exemplary flowchart (1600) illustrating the operation of a wireless communication device, such as a UE (110), according to a possible embodiment. In 1610, a signal may be received from a network. The signal may be transmitted, for example, from a base station, in a control channel, at least a first symbol of a subframe. For example, the signal may be transmitted in the first symbols of a subframe, in a PDCCH, a group common control channel, or another control channel.

[0064] In 1620, a DL sTTI pattern of different lengths of DL sTTIs for a subframe can be determined based on indications received from the network. The DL sTTI pattern can express how sTTIs with different symbol lengths are distributed within the subframe. For example, the sTTI pattern can specify different lengths of different consecutive sTTIs within the subframe. Different sTTI patterns can indicate different lengths for at least one sTTI with a given index in the subframe and other sTTIs with different indices in that subframe.

[0065] In 1630, at least one sPDCCH monitoring set may be determined. A normal PDCCH may correspond to a subframe length TTI, and an sPDCCH may correspond to an sTTI. Additionally, the sPDCCH may have a shorter length or frequency bandwidth than a normal PDCCH. At least one sPDCCH monitoring set may be determined from upper-level signaling or otherwise. For example, at least one sPDCCH monitoring set may be determined from upper-level signaling for a first number of sTTIs within a subframe and / or from indications for the remaining number of sTTIs within a subframe that do not include the first number of sTTIs. The first number of sTTIs may be the first sTTIs of the subframe. At least one sPDCCH monitoring set may include sPDCCH DL control candidates to be monitored by the device at the sTTIs of the subframe. sTTI may be shorter than the subframe length TTI. Different sTTIs may have different numbers of sPDCCH control candidates to monitor. sPDCCH may be a DL control channel that signals DL assignment or UL acknowledgment messages allocating time-frequency resources for sPDSCH / sPUSCH and corresponding receive / transmit configurations for the allocated resources. The time-frequency resources for sPDSCH / sPUSCH may include OFDM symbol(s) which are a subset of OFDM symbols within the subframe. In one example, the OFDM symbol(s) of sPDSCH / sPUSCH may be within the sTTI. According to a possible implementation, a determination regarding the number (L) of OFDM symbols for DL ​​control (sPDCCH) candidates to be monitored by the device may be made in the sTTI of the subframe.

[0066] In 1640, an sPDCCH belonging to at least one sPDCCH monitoring set may be received from the network. The sPDCCH may schedule DL data packet transmissions in the sPDCCH. Data packet transmissions are different from control transmissions. The sPDCCH may also display a rate matching indicator (i1) capable of displaying at least one OFDM symbol. The rate matching indicator may display a set of symbols within the sTTI or one of them, for example, the location and number of at least one symbol within the sTTI. There may be multiple rate matching indicators, multiple numbers of sPDCCH monitoring sets, multiple frequency resource sets, and multiple indicators. An sPDCCH belonging to at least one sPDCCH monitoring set received from the network may span multiple (L) OFDM symbols. The number (L) may be determined based on at least an upper layer configuration. The upper layer configuration may display one of the following options:

[0067] 1. For all sTTIs in the subframe, L = 1;

[0068] 2. For all sTTIs in the subframe, L = 2; and

[0069] 3. For the first number of sTTIs of the subframe, L = 1 and for the second number of sTTIs of the subframe, L = 2.

[0070] If the upper layer indicates option 3, the device can determine (L) for the sTTI of the subframe based on the sTTI index and the number of configured common reference signal (CRS) ports.

[0071] In 1650, a set of frequency resources (f1) can be determined. The set of frequency resources (f1) can be determined based on at least a rate matching indicator (i1). The set of frequency resources (f1) can also be determined based on control information in at least sPDCCH. The set of frequency resources (f1) can additionally be determined based on at least one sPDCCH monitoring set. The set of frequency resources (f1) may belong to a search space configured by upper-level signaling.

[0072] In 1660, sPDSCH can be decoded based on the fact that sPDSCH is at least rate-matched around a set of frequency resources (f1) belonging to at least one OFDM symbol indicated by a rate-matching indicator (i1). The set of frequency resources (f1) belonging to at least one OFDM symbol indicated by the rate-matching indicator (i1) indicates that REs can be declared as reserved for sPDSCH. A UE can assume that DL data for the UE maps to the REs of the OFDM symbols and the allocated RBs corresponding to the UE's DL resource allocation that is not declared as reserved for sPDSCH. The resource allocation can indicate which RBs and OFDM symbols are used for sPDSCH. Rate matching can distinguish between REs used for DL ​​data for a given device, such as a UE, within a DL resource allocation, and REs used or reserved for other purposes, such as control signaling, which may be used for other devices, such as at least one other UE.

[0073] According to a possible implementation, the rate matching indicator may be a first rate matching indicator (i1). At least one OFDM symbol may be at least one OFDM symbol of the first. The set of frequency resources (f1) may be the first set of frequency resources (f1). sPDCCH may additionally display a second rate matching indicator (i2) displaying at least one OFDM symbol of the second. A second set of frequency resources (f2) may be determined. The second set of frequency resources (f2) may be determined based on control information in at least sPDCCH. The second set of frequency resources (f2) may additionally be determined based on a set of configured resource blocks. A set of configured resource blocks, such as search spaces, may be used by other devices to monitor their own sPDCCH decoding candidates. A set of configured resource blocks may include only sPDCCH candidates that schedule UL data on sPUSCH. A set of configured resource blocks can be used by the device to receive UL approval. The number of OFDM symbol(s) indicated by the second rate matching indicator (i2) may be greater than at least one OFDM symbol(s) indicated by the first rate matching indicator (i1). sPDSCH may be decoded based on at least rate matching around a first set of frequency resources (f1) belonging to at least one first OFDM symbol indicated by the first rate matching indicator (i1) and a second set of frequency resources (f2) belonging to at least one second OFDM symbol indicated by the second rate matching indicator (i2).Accordingly, REs corresponding to the union of a first set of frequency resources (f1) belonging to at least one first OFDM symbol indicated by a first rate matching indicator (i1) and a second set of frequency resources (f2) belonging to at least one second OFDM symbol indicated by a second rate matching indicator (i2) may be considered / declared as reserved for sPDSCH. A UE may assume that DL data for the UE is mapped to the REs of the OFDM symbols and the allocated RBs corresponding to the UE's DL resource allocation that is not declared reserved for sPDSCH at least. Thus, sPDSCH is not mapped to the REs corresponding to the union.

[0074] FIG. 17 is an exemplary flowchart (1700) illustrating the operation of a network entity, such as a wireless communication device, such as a base station (120), according to a possible embodiment. In 1710, a mark may be transmitted from the network to the device. The mark may display a DL sTTI pattern of different length DL sTTIs for a subframe. The sTTI may be shorter in length than the subframe length TTI.

[0075] In 1720, at least one sPDCCH monitoring set may be indicated to the device. At least one sPDCCH monitoring set may be indicated to the UE, for example, by being transmitted or otherwise indicated. Upper layer signaling may indicate at least one sPDCCH monitoring set. For example, upper layer signaling for a first number of sTTIs within a subframe and / or indication for the remaining number of sTTIs within a subframe that does not include the first number of sTTIs may indicate at least one sPDCCH monitoring set. As an additional example, the indication may be transmitted in the control channel at least a first symbol of the subframe. At least one sPDCCH monitoring set may include sPDCCH DL control candidates to be monitored by the device in the sTTIs of the subframe.

[0076] In 1730, an sPDCCH belonging to at least one sPDCCH monitoring set may be transmitted. The sPDCCH may schedule DL data packet transmissions in the sPDSCH. The sPDCCH may also display a rate matching indicator (i1) displaying at least one OFDM symbol.

[0077] In 1740, at least a rate-matched sPDCCH may be transmitted around a set of frequency resources (f1) belonging to at least one OFDM symbol indicated by a rate-matching indicator (i1). The set of frequency resources (f1) may be determined based on at least the rate-matching indicator (i1). At least, control information in the sPDCCH may indicate the set of frequency resources (f1). At least, at least one sPDCCH monitoring set may indicate the set of frequency resources (f1).

[0078] According to a possible implementation, the rate matching indicator may be a first rate matching indicator (i1). At least one OFDM symbol may be at least one OFDM symbol of the first. The set of frequency resources (f1) may be a first set of frequency resources (f1). The sPDCCH may additionally display a second rate matching indicator (i2) displaying at least one OFDM symbol of the second. A second set of frequency resources (f2) may be displayed. For example, a second set of frequency resources (f2) may be displayed to the UE. At least, control information in the sPDCCH may display the second set of frequency resources (f2). Also, at least a set of configured resource blocks may display the second set of frequency resources (f2). The set of configured resource blocks may include only sPDCCH candidates that schedule UL data on the sPUSCH. sPDSCH can be transmitted, wherein sPDSCH can be rate-matched around a first set of frequency resources (f1) belonging to at least one first OFDM symbol indicated by a first rate-matching indicator (i1) and a second set of frequency resources (f2) belonging to at least one second OFDM symbol indicated by a second rate-matching indicator (i2).

[0079] Notwithstanding the specific steps illustrated in the drawings, it should be understood that various additional or different steps may be performed according to the embodiments, and that one or more of the specific steps may be rearranged, repeated, or eliminated in their entirety according to the embodiments. Additionally, some of the steps performed may be repeated simultaneously on a continuous or sequential basis while other steps are being performed. Furthermore, different steps may be performed by different elements in the disclosed embodiments or in a single element.

[0080] According to another possible embodiment, a signal from a network may be received by the device. A DL sTTI pattern may be determined for a subframe based on the signal received from the network. The sTTI may be shorter in length than the subframe length TTI. The DL sTTI pattern may represent how sTTIs having different symbol lengths are distributed within the subframe. An index of an sTTI may indicate the position of the sTTI in the DL sTTI pattern. For example, the sTTI pattern may specify different lengths of different consecutive sTTIs within the subframe. Different sTTI patterns may indicate different lengths for at least one sTTI having a given index in the subframe. The number of OFDM symbols for sPDCCH candidates to be monitored by the device in the sTTI of the subframe may be determined based at least on the DL sTTI pattern and the index of the sTTI within the subframe. The subframe may include a PDCCH and an sPDCCH. sPDCCH can correspond to sTTI, and PDCCH can correspond to subframe length TTI. sPDCCH candidates can occupy one or two symbols in all sTTIs of a subframe. For example, some sTTIs of a subframe may contain sPDCCH candidates occupying one symbol, and other sTTIs of a subframe may contain sPDCCH candidates occupying two symbols. sPDCCH candidates can be monitored and decoded according to a determined number of OFDM symbols. A subframe may contain CRSs, and sPDCCH candidates can be decoded based on the CRSs. According to a possible implementation, an indication may be received indicating the symbols within the sTTIs of a subframe occupied by the sPDCCH.For example, the indication may show whether sPDCCH occupies 1 symbol for all sTTIs in the subframe, 2 symbols for all sTTIs in the subframe, or 1 symbol for some sTTIs and 2 symbols for other sTTIs in the subframe.

[0081] According to another possible embodiment, the first indication and the second indication may be received by the device in a control channel. The second indication may be a 1-bit indication. The first indication and the second indication may be received in a UL acknowledgment transmitted in a DL sTTI in a control channel. The first indication may indicate resources for transmitting UL data in a UL sTTI in a UL subframe. The second indication may indicate a pattern for UL data symbols and UL DMRS symbols in a UL subframe. A subframe may include a pattern of at least two UL sTTIs of different lengths. Each UL sTTI may have a UL sTTI index in the pattern of UL sTTIs in the subframe. The second indication may indicate a pattern for UL data and UL DMRS symbols in the pattern of UL sTTIs in the UL subframe. UL DMRS locations may be determined based on at least the second indication and the UL sTTI index of the UL subframe. According to a possible implementation, a parameter may be received from a network. The parameter may indicate the location of a UL DMRS symbol for a scheduled UL sTTI to be used for demodulating UL data in a scheduled UL sTTI. The parameter may indicate the furthest possible UL DMRS symbol for a scheduled UL sTTI to be used for demodulating UL data in a scheduled UL sTTI. The UL DMRS location may be determined based on at least the parameter, the second indication, and the UL sTTI index of the UL subframe. The UL sTTI index may indicate the location of the UL sTTI in the UL subframe. There may be at least two possible indices, including a DMRS location index and an sTTI index. The UL DMRS and UL data may be transmitted based on the determined UL DMRS location.

[0082] FIG. 18 is an exemplary example (1800) of a multi-PRB set configuration for sPDCCH monitoring according to a possible embodiment. If a UE has multiple PRB sets for monitoring sPDCCH, it may be possible for the eNB to easily multiplex non-sTTI and sTTI UEs of the same subframe by transmitting an sPDCCH that schedules an sTTI UE on a PRB set that does not overlap with a non-sTTI transmission, and thus, the sPDCCH blocking rate is reduced. Similar to current EPDCCH designs, for each serving cell, upper-layer signaling may configure the UE with multiple PRB sets for sPDCCH monitoring. PRBs corresponding to each PRB set may be configured by the upper layers. In each sTTI of a subframe where the UE is enabled to perform sTTI operations, the UE may monitor some or all of the configured PRB sets.

[0083] For the example illustrated in Example (1800), the eNB can configure four PRB sets for sPDCCH control monitoring. Subframe n + 1 may have legacy PDSCH assignments that overlap with some sPDCCH monitoring sets such as 3 and 4, but the eNB can schedule sPDSCH in that subframe using the remaining sets such as 1 and 2. Thus, the UE can be configured to monitor sPDCCH candidates across multiple RB sets using a principle similar to EPDCCH-PRB-set configuration.

[0084] FIG. 19 is an exemplary example (1900) of sPDCCH decoding candidates belonging to different PRB-sets according to a possible embodiment. Assuming 7 sPDCCH candidates per sTTI, the UE can monitor either sets (1, 2, 3) or (4, 2, 3). The CCEs of the first two sets can be mapped within the first half of the system BW, and the CCEs of the second two sets can be mapped within the second half of the system BW.

[0085] Different PRB sets for sPDCCH monitoring may have different bandwidths, different numbers of decoding candidates, and support different set levels. For example, as illustrated in Example (1900), sets 1 and 4 from Example (1800) may include two decoding candidates with AL = 1 and one decoding candidate with AL = 2 (which takes about 3 RBs assuming 36 RE / CCEs); whereas sets 2 and 3 may have one candidate with AL = 4 and one candidate with AL = 8 (which takes about 12 RBs). Assuming 7 sPDCCH candidates per sTTI, the UE may monitor either sets (1, 2, 3) or (4, 2, 3). The eNB can signal which sets to monitor at the beginning of a subframe, for instance, based on knowledge of the resources to be given to non-sTTI operations. In this example, note that even if the UE misses the signal indicating which sets to monitor, the UE can always monitor sPDCCH-PRB-sets 2 and 3 configured in all sTTIs. Therefore, the UE can monitor a subset of sPDCCH RBs configured in the sTTIs of the subframe. Additionally, at the beginning of a subframe, the eNB can indicate which subsets to monitor. Even if the UE misses the indication to monitor a subset, the default subset can always be monitored.

[0086] Sets may be pruned if the UE can monitor fewer than 7 candidates in some sTTIs of a subframe, such as the sTTIs in the first slot, or in each of all sTTIs. For example, to monitor 4 candidates per sTTI, sets 1 and 4 may be pruned to have only one candidate with AL = 1, or a candidate with AL = 8 may be removed from set 2 while a candidate with AL = 4 may be removed from set 3.

[0087] As with the sTTIs of the first slot, when monitoring only two supported sPDCCH candidates per sTTI, sets 1 and 4 may contain only a single candidate with AL = 2, and set 2 may contain only one candidate with AL = 4 in some of the sTTIs, while set 3 may be empty, and in the remaining sTTIs, set 3 may contain only one candidate with AL = 4, while set 2 is empty.

[0088] In the above example, for each sTTI where 7 sPDCCH candidates are monitored, AL = 1, 4, and 8 each may have 2 candidates and AL = 2 may have 1 candidate. To have 2 candidates for AL = 1, 2, and 4 and only 1 candidate for AL = 8 as shown in Table 7, sets 1 and 4 each may include additional AL = 2 candidates, such as across CCEs 2-3 for set 1 and CCE18-19 for set 4, respectively. In odd sTTIs, set 2 may not have an AL = 8 candidate, and in even sTTIs, set 3 may not have an AL = 8 candidate.

[0089] According to another possible implementation, assuming 7 sPDCCH candidates per sTTI, the UE can monitor either set (1, 2, 3) or (4, 2, 3) based on signaling at the beginning of the subframe or based on the sTTI index.

[0090] FIG. 20 is an exemplary example (2000) of sPDCCH monitoring for a UE according to another possible embodiment. Assuming six sPDCCH candidates per sTTI, in odd sTTIs, the UE can monitor sets (1,2) or (3,2) based on signaling at the beginning of a subframe, and in even sTTIs, the UE can monitor sets (1,4) or (3,4) based on signaling at the beginning of a subframe.

[0091] FIG. 21 is an exemplary example (2100) of sPDCCH decoding candidates belonging to different PRB-sets according to other possible embodiments. Set 3 may include some of the decoding candidates belonging to sets 1 and 2. Set 6 may include some of the decoding candidates belonging to sets 4 and 5. The CCEs of the first three sets may be mapped within the first half of the system BW, and the CCEs of the second three sets may be mapped within the second half of the system BW.

[0092] The design of the sPDCCH search space can be classified into one of the following methods or a combination thereof. In one method, at each sTTI, the control region known to all UEs is quantized and which parts are available is signaled. In another method, at each sTTI, the system (or sTTI) bandwidth is quantized and which parts are available is signaled. In another method, at each sTTI, UL and DL sPDCCH candidates can be arranged so that the UE can determine which resources in its DL allocation are available for the sPDCCH by discovering its own DL approval. In another method, at each sTTI, unused sPDCCH-PRB sets are signaled among the configured sPDCCH-PRB sets to be monitored by the UE. Each of the above methods may have its own limitations, such as somewhat rough quantization granularity or control candidate batches, to avoid spending many bits on DL acceptance in 2OS-based DL sTTI where control overhead must be managed.

[0093] The same problem regarding the utilization of unused control resources can occur in the context of EPDCCH. Here, the PDSCH allocated to a UE can only be rate-matched around its own EPDCCH. Therefore, depending on resource allocation and sPDCCH configuration, a similar approach can be performed almost as well as other proposals without additional restrictions and specification efforts. However, some differences exist between EPDCCH and sPDCCH scenarios. One difference is that while up to 4 eCCEs may be suitable for PRB, for sPDCCH, assuming 36 RE / CCEs, more than one RB can be taken in an sTTI consisting of 2 OFDM symbols, assuming 2 symbols and 12 subcarriers per symbol. Another difference is when resource allocation granularity may differ, such as when larger RGB sizes can be used for sPDSCH. Another difference is that the sPDCCH length in terms of the number of symbols may be smaller than the number of symbols in sTTI. Another difference is that a 2OS-based sTTI UE may be multiplexed into a 0.5 ms-sTTI UE.

[0094] A UE can be configured to monitor sPDCCH decoding candidates in sTTI. The monitored candidates may belong to multiple sPDCCH-PRB sets. An eNB can configure the UE with multiple sPDCCH-PRB sets. Then, the eNB can indicate, for example at the beginning of a subframe, which of the configured sPDCCH decoding sets should be monitored in the subframe. For each sTTI, the eNB can indicate which of the configured sets is unused for the UE to use to receive sPDSCH in that sTTI. For example, an eNB can configure the UE with four sets, where each set may contain sPDCCH candidates spanning different CCEs (in the case of sTTI, a control channel element (CCE) is referred to as an sCCE). For example, Set 1 may include three sPDCCH decoding candidates, one candidate with AL = 2 spanning CCE0-1 and 2, and two candidates (CCE0, CCE1) with AL = 1. At each sTTI of a subframe, the eNB may indicate which of the monitoring sets is not used for control, such as which sPDCCH is available for sPDSCH reuse. For example, using 2 bits, the eNB may indicate which of the four configured sets is not used for control, as shown in Table 8.

[0095]

[0096] When sets overlap in CCEs, the meaning of available resources may be based on the overlap as shown in Table 9.

[0097]

[0098] The UE can extract resources such as CCEs that have decoded its sPDCCH from sTTI.

[0099] Rate matching bits can be interpreted in each sTTI block based on the refinement of the sPDCCH area in the slow DCI or based on the monitored sPDCCH sets signaled in the slow DCI, when the control area is distributed in the VRB domain. Information regarding unused sPDCCH areas in the sTTI of a subframe, signaled via the fast DCI in the sTTI, can be interpreted by the UE based on the set of sPDCCH-PRB sets to be monitored in the sTTI. For example, the set of sPDCCH-PRB sets to be monitored in the sTTI can be determined via the slow DCI signaled at the beginning of the subframe.

[0100] In the case of DMRS-based sPDCCH, localized transmission may be good. In such cases, the spots allocated in the figures above may not be good for some UEs in the frequency-selective channel. Therefore, it may be useful to have multiple locations. Also, if such locations are placed in each sTTI block to schedule UEs for multiple sTTI blocks, different numbers of bits exist in the sDCI, as more bits—for example, a specific number of bits per scheduled sTTI—may need to be transmitted.

[0101] To schedule multiple ULs, at least a MAC-CE based on recent active low-latency UEs may be used to modify UL candidates, for example, because the eNB may not know whether the UE has detected a slow DCI. If interpretation is performed based on a slow DCI, or if the UE has not detected a slow DCI, one of the following different UE behaviors may exist. In one behavior, the UE may assume that all possible UL candidates are used. In another behavior, the UE may assume that none of the possible UL candidates are used. In the other behavior, the UE may assume that a default set of possible UL candidates is used.

[0102] FIG. 22 is an exemplary block diagram of a device (2200) according to a possible embodiment, such as a UE (110), a base station (120), or any other wireless communication device disclosed herein. The device (2200) may include a housing (2210), a controller (2220) coupled to the housing (2210), an audio input and output circuit (2230) coupled to the controller (2220), a display (2240) coupled to the controller (2220), a transceiver (2250) coupled to the controller (2220), an antenna (2255) coupled to the transceiver (2250), a user interface (2260) coupled to the controller (2220), a memory (2270) coupled to the controller (2220), and a network interface (2280) coupled to the controller (2220). The device (2200) may not necessarily include all of the elements exemplified for different embodiments of the present disclosure. The device (2200) can perform the methods described in all embodiments.

[0103] The display (2240) may be a viewfinder, a liquid crystal display (LCD), a light-emitting diode (LED) display, an organic light-emitting diode (OLED) display, a plasma display, a projection display, a touch screen, or any other device that displays information. The transceiver (2250) may include a transmitter and / or a receiver. The audio input and output circuit (2230) may include a microphone, a speaker, a transducer, or any other audio input and output circuit. The user interface (2260) may include a keypad, a keyboard, buttons, a touchpad, a joystick, a touch screen display, other additional displays, or any other device useful for providing an interface between the user and the electronic device. The network interface (2280) may be a Universal Serial Bus (USB) port, an Ethernet port, an infrared transmitter / receiver, an IEEE 1394 port, a WLAN transceiver, or any other interface capable of connecting the device to a network, a device, and / or a computer and transmitting and receiving data communication signals. The memory (2270) may include random access memory, read-only memory, optical memory, solid-state memory, flash memory, removable memory, hard drive, cache, or any other memory that can be combined with a device.

[0104] The device (2200) or controller (2220) may implement any operating system, such as Microsoft Windows®, UNIX®, or LINUX®, Android™, or any other operating system. The device operating software may be written in any programming language, such as C, C++, Java, or Visual Basic. The device software may also run on an application framework, such as the Java® framework, the .NET® framework, or any other application framework. The software and / or operating system may be stored in memory (2270) or elsewhere on the device (2200). The device (2200) or controller (2220) may also use hardware to implement the disclosed operations. For example, the controller (2220) may be any programmable processor. Additionally, the disclosed embodiments may be implemented on a general-purpose or special-purpose computer, a programmed microprocessor or microprocessor, peripheral integrated circuit elements, a custom integrated circuit or other integrated circuits, hardware / electronic logic circuits, such as discrete element circuits, programmable logic devices, such as programmable logic arrays, field-programmable gate arrays, etc. Generally, the controller (2220) may be any controller or processor device or devices capable of operating the device and implementing the disclosed embodiments. Some or all of the additional elements of the device (2200) may also perform some or all of the operations of the disclosed embodiments.

[0105] When operating, the transceiver (2250) may receive a signal from the network. The controller (2220) may determine a DL sTTI pattern of different length DL sTTIs for a subframe based on the signal received from the network. The controller (2220) may determine at least one sPDCCH monitoring set containing sPDCCH DL control candidates to be monitored by the device (2200) in the sTTI of the subframe. The sTTI may be shorter in length than the subframe length TTI. At least one sPDCCH monitoring set may be determined from upper-level signaling. At least one sPDCCH monitoring set may also be determined from upper-level signaling for a first number of sTTIs within the subframe and / or from a signal for the remaining number of sTTIs within the subframe that do not include the first number of sTTIs. The transceiver (2250) may receive an sPDCCH from a network that belongs to at least one sPDCCH monitoring set. The sPDCCH may schedule DL data packet transmissions in the sPDCCH. The sPDCCH may also display a rate matching indicator (i1) that indicates at least one OFDM symbol. The controller (2220) may determine a set of frequency resources (f1). The set of frequency resources (f1) may be determined based at least on the rate matching indicator (i1). The set of frequency resources (f1) may also be determined based on control information in at least the sPDCCH. The controller (2220) may decode the sPDSCH based on at least a rate-matched sPDSCH around the set of frequency resources (f1) that belongs to at least one OFDM symbol indicated by the rate matching indicator (i1).

[0106] According to a possible implementation, the rate matching indicator may be a first rate matching indicator (i1). At least one OFDM symbol may be at least one OFDM symbol of the first. One set of frequency resources (f1) may be the first set of frequency resources (f1). sPDCCH may additionally display a second rate matching indicator (i2) displaying at least one OFDM symbol of the second. The controller (2220) may determine the second set of frequency resources (f2). The second set of frequency resources (f2) may be determined based on control information in at least sPDCCH. The controller (2220) can decode sPDSCH based on at least rate-matched sPDSCH around a first set of frequency resources (f1) belonging to at least one first OFDM symbol indicated by a first rate-matching indicator (i1) and a second set of frequency resources (f2) belonging to at least one second OFDM symbol indicated by a second rate-matching indicator (i2).

[0107] According to another possible embodiment, the device (2200) may operate as a network entity such as a base station (120). The transceiver (2250) may display at least one sPDCCH monitoring set containing sPDCCH DL control candidates to be monitored by the device in the sTTI of a subframe. For example, at least one sPDCCH monitoring set may be displayed to the UE. The transceiver (2250) may transmit to the device an sPDCCH belonging to one of the at least one sPDCCH monitoring set. The sPDCCH may schedule DL data packet transmissions in the sPDCCH. The sPDCCH may also display a rate matching indicator (i1) capable of displaying at least one OFDM symbol. The transceiver (2250) can transmit at least a rate-matched sPDSCH around a set of frequency resources (f1) belonging to at least one OFDM symbol indicated by a rate-matching indicator (i1). The controller (2220) can determine and / or generate information transmitted by the transceiver. According to this embodiment, the device (2200) can also perform additional operations such as those described in the flowchart (1700) and those described in other embodiments.

[0108] The method of the present disclosure may be implemented on a programmed processor. However, controllers, flowcharts, and modules may also be implemented on a general-purpose or special-purpose computer, a programmed microprocessor or microcontroller and peripheral integrated circuit elements, integrated circuits, hardware electronics or logic circuits, such as discrete circuits, programmable logic devices, etc. In general, any device inhabited by a finite state machine capable of implementing the flowcharts illustrated in the drawings may be used to implement the processor functions of the present disclosure.

[0109] Although the present disclosure has been described with respect to specific embodiments thereof, it is evident to those skilled in the art that many alternatives, modifications, and variations are apparent. For example, various components of the embodiments may be exchanged, added, or substituted in other embodiments. Furthermore, not all elements of each drawing are essential to the operation of the disclosed embodiments. For example, a person skilled in the art of the disclosed embodiments will be able to practice and use the teachings of the present disclosure by utilizing only the elements of the independent claims. Accordingly, the embodiments of the present disclosure described herein are intended to be illustrative rather than restrictive. Various modifications may be made without departing from the spirit and scope of the present disclosure.

[0110] In this document, correlative terms such as “first” and “second,” etc., may be used merely to distinguish one entity or action from another entity or action and do not necessarily require or imply any actual relationship or order between such entities or actions. Phrases following a list, such as “at least one of,” “at least one selected from a group of,” or “at least one selected from,” are defined to mean one, some, or all of the elements within the list, rather than all of them. The terms “include,” “including,” “including,” or any other variations thereof are intended to encompass non-exclusive inclusion so that a process, method, object, or device including a list of elements may include not only those elements but also other elements inherent in or not explicitly listed in such process, method, object, or device. An element proceeding in the singular form does not, without further constraints, exclude the existence of additional identical elements in a process, method, object, or device including that element. Additionally, the term "another" is defined as at least a second or more. Terms such as "including," "having," etc., as used herein are defined as "including." Furthermore, the background section is written as the inventor's own understanding of the context of some embodiments at the time of filing and includes the inventor's own awareness of any problems in the prior art and / or problems experienced in the inventor's own work.

Claims

Claim 1 A method for wireless communication by user equipment, wherein the method comprises: determining at least one shortened physical downlink control channel monitoring set including shortened physical downlink control channel downlink control candidates to be monitored by the user equipment in a shortened transmission time interval of a subframe — wherein the shortened transmission time interval is shorter in length than the subframe length transmission time interval, and a normal physical downlink control channel corresponds to at least a downlink transmission of the subframe length transmission time interval, and the at least one shortened physical downlink control channel monitoring set spans a set of orthogonal frequency division multiplexed symbols, and the shortened physical downlink control channel corresponds to at least a downlink transmission of the shortened transmission time interval —; receiving from a network by the user equipment a shortened physical downlink control channel belonging to one of the at least one shortened physical downlink control channel monitoring set — wherein the shortened physical downlink control channel schedules downlink data packet transmissions in a shortened physical downlink shared channel within the shortened transmission time interval, and the shortened physical downlink control channel also [schedules] at least one orthogonal frequency division multiplexed in the shortened transmission time interval Displaying an indicator indicating a multiplexing symbol, wherein the at least one orthogonal frequency division multiplexing symbol is different from the orthogonal frequency division multiplexing symbols spanning the shortened physical downlink control channel downlink control candidates, and the indicator further indicates which resources are available for transmission of the shortened physical downlink shared channel to the user equipment —; a step of determining a set of frequency resources;and a method comprising the step of decoding downlink data packet transmissions in the shortened physical downlink shared channel based on the fact that the set of frequency resources is not available for the shortened physical downlink shared channel, wherein the set of frequency resources belongs to the at least one orthogonal frequency division multiplexing symbol, and the shortened physical downlink shared channel is at least rate-matched around the set of frequency resources belonging to the at least one orthogonal frequency division multiplexing symbol.; Claim 2 A method according to claim 1, wherein the set of frequency resources is determined based at least on the indicator. Claim 3 In claim 1, the indicator is a first indicator, the at least one orthogonal frequency division multiplexing symbol is a first at least one orthogonal frequency division multiplexing symbol, the set of frequency resources is a first set of frequency resources, and the shortened physical downlink control channel further indicates a second indicator indicating a second at least one orthogonal frequency division multiplexing symbol, and the method further includes the step of determining a second set of frequency resources, and the decoding step includes the step of decoding downlink data packet transmissions in the shortened physical downlink shared channel based on the fact that the first set of frequency resources belonging to the first at least one orthogonal frequency division multiplexing symbol indicated by the first indicator are not available for the shortened physical downlink shared channel, and the second set of frequency resources belonging to the second at least one orthogonal frequency division multiplexing symbol indicated by the second indicator are not available for the shortened physical downlink shared channel. Claim 4 In paragraph 3, the method wherein the frequency resources of the second set are determined based on control information in at least the shortened physical downlink control channel. Claim 5 In paragraph 4, the method wherein the frequency resources of the second set are additionally determined based on a set of configured resource blocks. Claim 6 A method according to claim 1, wherein the at least one shortened physical downlink control channel monitoring set comprises a first shortened physical downlink control channel monitoring set spanning a first set of orthogonal frequency division multiplexing symbols, and the at least one orthogonal frequency division multiplexing symbol belongs to a second shortened physical downlink control channel monitoring set spanning a second set of orthogonal frequency division multiplexing symbols, and the first set of orthogonal frequency division multiplexing symbols is a subset of the second set of orthogonal frequency division multiplexing symbols. Claim 7 In claim 6, the method comprises a second shortened physical downlink control channel monitoring set including shortened physical downlink control channel candidates having a shortened transmission time interval length different from the shortened transmission time interval. Claim 8 delete Claim 9 In claim 1, the method wherein at least one shortened physical downlink control channel monitoring set is determined from upper layer signaling. Claim 10 delete Claim 11 delete Claim 12 delete Claim 13 As a device, a controller determining at least one shortened physical downlink control channel monitoring set comprising shortened physical downlink control channel downlink control candidates to be monitored by the device at a shortened transmission time interval of a subframe ― said shortened transmission time interval is shorter in length than a subframe length transmission time interval, and a normal physical downlink control channel corresponds to at least a downlink transmission of said subframe length transmission time interval, said at least one shortened physical downlink control channel monitoring set spans a set of orthogonal frequency division multiplexed symbols, and the shortened physical downlink control channel corresponds to a downlink transmission of said shortened transmission time interval ―;and includes a transceiver coupled to the controller, wherein the transceiver receives from a network a shortened physical downlink control channel belonging to one of the at least one shortened physical downlink control channel monitoring set, the shortened physical downlink control channel schedules downlink data packet transmissions in a shortened transmission time interval in a shortened physical downlink shared channel, the shortened physical downlink control channel also displays an indicator displaying at least one orthogonal frequency division multiplexing symbol in the shortened transmission time interval, the at least one orthogonal frequency division multiplexing symbol is different from the orthogonal frequency division multiplexing symbols spanning the shortened physical downlink control channel downlink control candidates, and the indicator further indicates which resources are available for transmission in the shortened physical downlink shared channel to the device, the controller determines a set of frequency resources, and the controller decodes the downlink data packet transmissions in the shortened physical downlink shared channel based on whether the set of frequency resources is not available for the shortened physical downlink shared channel, and the set of frequency resources is the at least one orthogonal A device belonging to a frequency division multiplexing symbol, wherein the shortened physical downlink shared channel is at least rate-matched around a set of frequency resources belonging to at least one orthogonal frequency division multiplexing symbol. Claim 14 In paragraph 13, the set of frequency resources is determined at least based on the indicator. Claim 15 A device according to claim 13, wherein the indicator is a first indicator, the at least one orthogonal frequency division multiplexing symbol is a first at least one orthogonal frequency division multiplexing symbol, the set of frequency resources is a first set of frequency resources, the shortened physical downlink control channel further indicates a second indicator indicating a second at least one orthogonal frequency division multiplexing symbol, the controller determines a second set of frequency resources, and the controller decodes the downlink data packet transmissions in the shortened physical downlink shared channel based on the fact that the first set of frequency resources belonging to the first at least one orthogonal frequency division multiplexing symbol indicated by the first indicator are not available for the shortened physical downlink shared channel, and the second set of frequency resources belonging to the second at least one orthogonal frequency division multiplexing symbol indicated by the second indicator are not available for the shortened physical downlink shared channel. Claim 16 In paragraph 15, the device wherein the frequency resources of the second set are determined based on control information in at least the shortened physical downlink control channel. Claim 17 In paragraph 13, the device, wherein the set of frequency resources is determined based on control information in at least the shortened physical downlink control channel. Claim 18 delete Claim 19 delete Claim 20 delete Claim 21 A method according to claim 1, wherein the indicator comprises a rate matching indicator that at least indicates that the shortened physical downlink sharing channel is not mapped to a subset of resources allocated through the shortened physical downlink control channel for the shortened physical downlink sharing channel. Claim 22 A method according to claim 1, wherein the at least one shortened physical downlink control channel monitoring set further spans a first set of frequency resources, the step of determining the set of frequency resources includes the step of determining a second set of frequency resources based on at least the first set of frequency resources, and the decoding step includes the step of decoding downlink data packet transmissions in the shortened physical downlink shared channel based on the fact that the second set of frequency resources belonging to the at least one orthogonal frequency division multiplexing symbol indicated by the indicator are not available in the shortened physical downlink shared channel. Claim 23 In paragraph 13, the device comprises, wherein the at least one shortened physical downlink control channel monitoring set comprises a first shortened physical downlink control channel monitoring set spanning a first set of orthogonal frequency division multiplexing symbols, and the at least one orthogonal frequency division multiplexing symbol belongs to a second shortened physical downlink control channel monitoring set spanning a second set of orthogonal frequency division multiplexing symbols, and the first set of orthogonal frequency division multiplexing symbols is a subset of the second set of orthogonal frequency division multiplexing symbols. Claim 24 In paragraph 13, the device comprises a rate matching indicator that indicates at least that a subset of resources not mapped to the shortened physical downlink sharing channel is from a set of resources allocated to the shortened physical downlink sharing channel through the shortened physical downlink control channel. Claim 25 In paragraph 13, the at least one shortened physical downlink control channel monitoring set further spans a first set of frequency resources, and the controller determines a set of frequency resources by determining a second set of frequency resources based on at least the first set of frequency resources, and the controller decodes the downlink data packet transmissions in the shortened physical downlink shared channel based on the fact that the second set of frequency resources belonging to the at least one orthogonal frequency division multiplexing symbol indicated by the indicator are not available in the shortened physical downlink shared channel. Claim 26 A method according to claim 1, wherein the set of orthogonal frequency division multiplexing symbols comprises a plurality of sets of orthogonal frequency division multiplexing symbols, the set of frequency resources comprises a plurality of sets of frequency resources, and the step of decoding the downlink data packet transmissions in the shortened physical downlink shared channel comprises the step of decoding the downlink data packet transmissions in the shortened physical downlink shared channel based on the fact that the shortened physical downlink shared channel is at least rate-matched around the set of frequency resources belonging to the at least one orthogonal frequency division multiplexing symbol indicated by the indicator. Claim 27 In paragraph 13, the set of orthogonal frequency division multiplexing symbols comprises a plurality of sets of orthogonal frequency division multiplexing symbols, the set of frequency resources comprises a plurality of sets of frequency resources, and the controller decodes the downlink data packet transmissions in the shortened physical downlink shared channel based on the fact that the shortened physical downlink shared channel is at least rate-matched around the set of frequency resources belonging to the at least one orthogonal frequency division multiplexing symbol indicated by the indicator. Claim 28 In paragraph 23, the device comprises a second shortened physical downlink control channel monitoring set including shortened physical downlink control channel candidates having a shortened transmission time interval length different from the shortened transmission time interval.

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