CN106961732B - Method and apparatus for reducing transmission delay - Google Patents
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- CN106961732B CN106961732B CN201610016090.2A CN201610016090A CN106961732B CN 106961732 B CN106961732 B CN 106961732B CN 201610016090 A CN201610016090 A CN 201610016090A CN 106961732 B CN106961732 B CN 106961732B
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Abstract
Embodiments of the present disclosure provide a method and apparatus for reducing transmission delay. The method includes a base station configuring a first resource for a first data transmission with control signaling, wherein the first data transmission has a short Transmission Time Interval (TTI) of less than 1 millisecond; and scheduling the first data transmission in the first resource in response to the first resource being configured. The embodiment of the disclosure can realize resource allocation for short TTI transmission under the condition of being compatible with the existing resource allocation mode for common TTI transmission, and can effectively reduce the scheduling signaling overhead for short TTI transmission, thereby realizing the reduction of transmission delay.
Description
Technical Field
Embodiments of the present disclosure generally relate to the field of wireless communications, and in particular, to a method and apparatus for reducing transmission delay.
Background
In the long term evolution-advanced (LTE-a) system and the upcoming 5 th generation mobile communication (5G) system, low transmission delay becomes more and more important and can be beneficial for some existing and/or new applications requiring low transmission delay, e.g., some critical applications, remote control, autonomous driving, and TCP applications, etc.
To reduce transmission delay, shortening the Transmission Time Interval (TTI) is an important way. In existing LTE-a systems, the TTI for data transmission is typically 1 millisecond (ms). To further reduce the transmission delay, the TTI length may be reduced to, for example, 0.5 ms. Meanwhile, the requirement of backward compatibility requires that data transmission having a normal TTI (hereinafter, referred to as normal TTI transmission) will coexist with data transmission having a short TTI (hereinafter, referred to as short TTI transmission) within the same carrier. One possible multiplexing scheme for short TTI transmissions and normal TTI transmissions is Time Division Multiplexing (TDM), e.g., some subframes are used for short TTI transmissions. However, TDM may compromise the benefits of low delay for short TTI transmissions, as only partial subframes can be used in TDM. Therefore, Frequency Division Multiplexing (FDM) of short TTI transmissions and normal TTI transmissions becomes a better choice. FDM means that normal TTI transmissions and short TTI transmissions need to coexist within the same subframe. Considering that there may be normal TTI transmissions with type 0, type 1, type 2 with localized or distributed resource allocation, and hybrid resource allocation in the downlink subframe, the resource allocation for short TTI transmissions is not easy, and it needs to be compatible with existing resource allocation (i.e. type 0, type 1, type 2 with localized or distributed resource mapping, and hybrid resource allocation). On the other hand, a relatively large portion of short TTI traffic may have smaller data packets, and therefore, it is desirable to reduce the scheduling signaling overhead for short TTI traffic to improve signaling efficiency.
Therefore, there is a need in the art for a resource configuration mechanism for short TTI transmissions to address the above-mentioned problems.
Disclosure of Invention
Embodiments of the present disclosure are directed to a method and apparatus for reducing transmission delay.
According to an aspect of the present disclosure, there is provided a method for reducing transmission delay in a base station, including: configuring a first resource for a first data transmission with control signaling, wherein the first data transmission has a short transmission time interval of less than 1 millisecond; and scheduling the first data transmission in the first resource in response to the first resource being configured.
In some embodiments, configuring the first resource for the first data transmission with the control signaling comprises: the first resource is configured by broadcasting cell-specific signaling within a cell.
In some embodiments, the cell-specific signaling is embedded in broadcast system message signaling.
In some embodiments, configuring the first resource for the first data transmission with the control signaling comprises: configuring the first resource by using user equipment-specific radio resource control signaling, wherein the transmission mode of the radio resource control signaling is any one of unicast and multicast.
In some embodiments, configuring the first resource for the first data transmission with the control signaling comprises: configuring the first resource by using physical layer dynamic control signaling, wherein the physical layer dynamic control signaling is transmitted in any one of the following manners: unicast, multicast, and broadcast.
In some embodiments, the basic unit of the first resource is any one of: a resource block; and a resource block group, wherein the resource block group includes a predetermined number of resource blocks.
In some embodiments, configuring the first resource for the first data transmission with the control signaling comprises: configuring the first resource with a basic unit of resource block groups with a binary bitmap in the control signaling, wherein each binary bit in the binary bitmap corresponds to one resource block group.
In some embodiments, configuring the first resource in a basic unit of resource block groups with a binary bitmap in the control signaling comprises: using a binary bit of 1 in the binary bitmap to indicate that a corresponding resource block group belongs to the first resource; and using a bit of 0 in the binary bitmap to indicate that the corresponding resource block group does not belong to the first resource.
In some embodiments, configuring the first resource for the first data transmission with the control signaling comprises: configuring the first resource in a resource block basic unit with the control signaling such that the first resource comprises a first integer number or a last integer number of resource blocks in a distributed resource allocation type in a resource block basic unit.
In some embodiments, the method further comprises: scheduling a second data transmission having a normal transmission time interval using a second resource, wherein the second resource is not configured for the first data transmission.
In some embodiments, the method further comprises: scheduling the second data transmission using resources of the first resources not occupied by the first data transmission.
According to another aspect of the present disclosure, there is provided an apparatus for reducing transmission delay, including: a first resource configuration means configured to configure a first resource for a first data transmission with control signaling, wherein the first data transmission has a short transmission time interval of less than 1 millisecond; and a first data transmission scheduling means configured to schedule the first data transmission in the first resource in response to the first resource being configured.
In some embodiments, the first resource configuration means is configured to: the first resource is configured by broadcasting cell-specific signaling within a cell.
In some embodiments, the cell-specific signaling is embedded in broadcast system message signaling.
In some embodiments, the first resource configuration means is configured to: configuring the first resource by using user equipment-specific radio resource control signaling, wherein the transmission mode of the radio resource control signaling is any one of unicast and multicast.
In some embodiments, the first resource configuration means is configured to: configuring the first resource by using physical layer dynamic control signaling, wherein the physical layer dynamic control signaling is transmitted in any one of the following manners: unicast, multicast, and broadcast.
In some embodiments, the basic unit of the first resource is any one of: a resource block; and a resource block group, wherein the resource block group includes a predetermined number of resource blocks.
In some embodiments, the first resource configuration means is configured to: configuring the first resource with a basic unit of resource block groups with a binary bitmap in the control signaling, wherein each binary bit in the binary bitmap corresponds to one resource block group.
In some embodiments, configuring the first resource in a basic unit of resource block groups with a binary bitmap in the control signaling comprises: using a binary bit of 1 in the binary bitmap to indicate that a corresponding resource block group belongs to the first resource; and using a bit of 0 in the binary bitmap to indicate that the corresponding resource block group does not belong to the first resource.
In some embodiments, the first resource configuration means is configured to: configuring the first resource in a resource block basic unit with the control signaling such that the first resource comprises a first integer number or a last integer number of resource blocks in a distributed resource allocation type in a resource block basic unit.
In some embodiments, the apparatus further comprises: a second data transmission scheduling device configured to schedule a second data transmission having a normal transmission time interval using a second resource, wherein the second resource is not configured for the first data transmission.
In some embodiments, the second data transmission scheduling apparatus is further configured to: scheduling the second data transmission using resources of the first resources not occupied by the first data transmission.
According to the method and the device for reducing the transmission delay, the resource allocation for the short TTI transmission can be realized under the condition of being compatible with the existing resource allocation mode for the common TTI transmission, and the scheduling signaling overhead for the short TTI transmission can be effectively reduced, so that the transmission delay is reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and not to limit the disclosure. In the drawings:
fig. 1 illustrates a flow diagram of a method 100 for reducing transmission delay in accordance with an embodiment of the present disclosure;
fig. 2 illustrates a schematic diagram of resource allocation for short TTI transmissions, according to an embodiment of the present disclosure;
fig. 3 illustrates a schematic diagram of resource allocation for short TTI transmissions, according to an embodiment of the present disclosure;
fig. 4 illustrates a schematic diagram of resource allocation for short TTI transmissions, according to an embodiment of the present disclosure;
fig. 5 illustrates a schematic diagram of resource allocation for short TTI transmissions, according to an embodiment of the present disclosure;
fig. 6 illustrates a schematic diagram of resource allocation for short TTI transmissions, according to an embodiment of the present disclosure; and
fig. 7 illustrates a block diagram of an apparatus 700 for reducing transmission delay in accordance with an embodiment of the present disclosure.
Like or corresponding reference characters designate like or corresponding parts throughout the several views.
Detailed Description
Hereinafter, various exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. It should be noted that the drawings and description relate to exemplary embodiments only. It is noted that from the following description, alternative embodiments of the structures and methods disclosed herein are readily contemplated and may be employed without departing from the principles of the present disclosure as claimed.
It should be understood that these exemplary embodiments are given solely for the purpose of enabling those skilled in the art to better understand and to practice the present disclosure, and are not intended to limit the scope of the present disclosure in any way.
The terms "including," comprising, "and the like, as used herein, are to be construed as open-ended terms, i.e.," including/including but not limited to. The term "based on" is "based, at least in part, on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment". Relevant definitions for other terms will be given in the following description.
Hereinafter, a technical solution for reducing transmission delay according to an embodiment of the present disclosure will be described in detail with reference to the accompanying drawings. For purposes of illustration, the following embodiments are described with respect to downlink resource configuration in an LTE-a system. However, it should be understood that embodiments of the present disclosure are not limited to downlink resource configuration in LTE-a systems.
For convenience of describing the following embodiments, first, a downlink resource allocation manner in the existing LTE-a system is briefly introduced. In the existing LTE-a system, there are 3 resource allocation types for a Physical Downlink Shared Channel (PDSCH): type 0, type 1, and type 2. The specific type of resource allocation used depends on the selected Downlink Control Information (DCI) format and the associated bits in the DCI. Before describing the resource allocation of type 0 and type 1, the concept of Resource Block Group (RBG) is described first. An RBG is a set of contiguous localized virtual resource blocks (localized VRBs). The size P of an RBG (i.e., the number of VRBs contained in each RBG, and the number of VRBs contained in the last RBG may be less than P) is related to the system bandwidth, and the correspondence is shown in table 1:
TABLE 1 correspondence between system Bandwidth and RBG size
Corresponding to the bandwidth of the downlink system
Total number of RBGs NRBGIs composed of
Wherein, before
The size of each RBG is P; if it is not
％P>0, then the last RBG is of size
E.g., lower downlink bandwidth
One Resource Block (RB) for example, where P is 3 and the total number of RBGs NRBGIs a mixture of the following components in a ratio of 17,wherein the first 16 RBGs each include 3 VRBs and the last 1 RBG includes only 2 VRBs. In the resource allocation of type 0, the RBGs allocated to the UE are indicated by a binary bitmap (bitmap). The bitmap contains N in totalRBGOne binary bit, each binary bit corresponding to 1 RBG. If a certain RBG is allocated to a certain UE, the corresponding binary digit in the bitmap is set to be 1; otherwise it is set to 0. As can be seen, the resource allocation of type 0 supports non-contiguous RB allocation in the frequency domain, the minimum unit of scheduling thereof is RBG, and thus resources cannot be allocated per single RB. In type 1 resource allocation, all RBGs are divided into P subsets, P being the size of the RBG. Each RBG subset p (0 ≦ p)<P) contains all RBGs starting from RBG P with an interval P. VRBs assigned to a certain UE must be from the same subset. In the resource allocation of type 1, VRBs allocated to a UE are indicated by 3 fields. Wherein the first field is used to execute the selected RBG subset, i.e., the value of p; a second field for specifying whether resources within the subset are offset; and the third field contains a bitmap in which each binary bit corresponds to a VRB in the selected RBG subset. It can be seen that the resource allocation of type 1 supports non-contiguous RB allocation in the frequency domain and supports allocation with a granularity of 1 RB. In type 2 resource allocation, the resource allocated to a UE is a contiguous segment of VRBs, which may be centralized or distributed. For centralized VRB allocation, the resources allocated to a certain UE may range from 1 VRB to all VRBs of the entire system bandwidth; for distributed VRB allocation, the resources allocated to a certain UE differ with the specific DCI format. In short, type 2 resource allocation only supports allocation of contiguous VRBs, and unlike type 0 and type 1 resource allocation only supporting localized VRB allocation, type 2 resource allocation supports both localized VRBs and distributed VRBs.
As described above, in order to implement multiplexing of short TTI (e.g., 0.5ms) transmission and normal TTI (e.g., 1ms) transmission in a single carrier, the multiplexing manner of FDM may be applied, i.e., such that normal TTI transmission and short TTI transmission can coexist within the same subframe. Considering that there may be normal TTI transmissions with type 0, type 1, type 2 resource allocation with localized and distributed resource allocation, and mixed resource allocation in a subframe, there is a need for compatibility with existing resource allocation (i.e., type 0, type 1, type 2 resource allocation with localized and distributed resource mapping, and mixed resource allocation) for short TTIs, while there is a need to reduce the scheduling signaling overhead for short TTI data to improve signaling efficiency.
To address the above-mentioned problems, fig. 1 illustrates a flow diagram of a method 100 for reducing transmission delay in accordance with an embodiment of the present disclosure. For example, the method 100 may be performed by an evolved base station (eNB) in an LTE-a system. As shown in fig. 1, the method 100 may include steps S101 to S102.
In step S101, a first resource for a first data transmission is configured with control signaling, wherein the first data transmission has a short TTI of less than 1 millisecond (e.g., 0.5 ms). In the following description, "first data transmission" and "short TTI transmission" may be used interchangeably, and "first resource" and "resource for short TTI transmission" may be used interchangeably.
In some embodiments, the eNB may configure the first resource for the short TTI transmission with cell-specific signaling, which may be embedded in system message block type 2(SIB2) system message signaling in the LTE-a system, and which may be broadcast by the eNB within the cell. In some embodiments, the first resource for the short TTI transmission may also be configured with UE-specific Radio Resource Control (RRC) signaling, which may be transmitted by the eNB to one or more UEs within the cell in a unicast or multicast manner. Additionally or alternatively, the eNB may also configure the first resource using physical layer dynamic control signaling, which may be transmitted in a unicast, multicast, or broadcast manner.
In some embodiments, the configured basic unit of the first resource may be an RB or an RBG, wherein the RBG may include a predetermined number of resource blocks. For example, the first resource with RBG as a basic unit may be configured by using a binary bitmap in the control signaling, thereby being compatible with the resource allocation manners of type 0 and type 1. For example,each bin in the bin map may correspond to one resource block group, and a bin of 1 may be used to indicate that the corresponding RBG belongs to the first resource (i.e., a resource for a short TTI), and a bin of 0 may be used to indicate that the corresponding RBG belongs to the first resource. Additionally or alternatively, the first resource in the basic unit of resource blocks may be configured with control signaling such that the first resource comprises a first integer number or a last integer number of resource blocks in a distributed resource allocation type (e.g., type 2) in the basic unit of resource blocks. For example, fig. 2 illustrates a schematic diagram of resource allocation for short TTI transmission in a type 2 resource allocation with distributed resource mapping. In FIG. 2, NVBRThe number of VBRs used for type 2 resource allocation may be indicated. As shown in fig. 2, in type 2 resource allocation with distributed resource mapping, the beginning part (e.g., the first n, where n is an integer) or the end part (e.g., the last m, where m is an integer) of the distributed VRB is allocated for short TTI transmission, so that the distributed VRB is not split into two discontinuous parts.
Next, the method 100 proceeds to step S102. In step S102, a first data transmission (i.e., a short TTI transmission) is scheduled in a first resource in response to the first resource being configured.
In some embodiments, once resources for short TTI transmissions are configured, the short TTI transmissions may be restricted to the configured resources. Furthermore, in order to keep the scheduling overhead as low as possible, the resource allocation signaling for the short TTI transmission may preferably be based on the first resources configured for the short TTI transmission. In this way, the overhead of resource allocation signaling can be greatly reduced, especially if the resources configured for short TTI transmissions are significantly lower than the overall system bandwidth. For example, if the system bandwidth is 20MHz (i.e., 100 physical resource blocks) and the resources configured for short TTI transmissions include 24 Physical Resource Blocks (PRBs), the resource configuration signaling overhead can be reduced by approximately 75%. The aggregated configuration resources for short TTI transmissions appear in the logical view as a virtual carrier with a narrower bandwidth nested within the carrier.
In some embodiments, the eNB may schedule the normal TTI transmission with a second resource that is not configured for short TTI transmissions. In other embodiments, the eNB may also schedule the normal TTI transmission using resources of the first resources that are not occupied by the short TTI transmission.
The method 100 ends so far.
Several embodiments of the present disclosure are further described below in conjunction with fig. 3-6. Note that in the following embodiments, it is assumed that the carrier bandwidth for coexistence of short TTI transmission and normal TTI transmission is 10 MHz. It should be understood that embodiments of the present disclosure may be applied to other carrier bandwidths, for example, 15MHz or 20 MHz.
Fig. 3 illustrates a schematic diagram of resource allocation for short TTI transmissions according to one embodiment of the present disclosure.
In the embodiment shown in fig. 3, the carrier bandwidth is assumed to be 10MHz (i.e., carrier bandwidth is 10 MHz)
The RBG size is 3 as defined in the existing LTE-a system (as shown in table 1). In this case, the bitmap indicating resources configured for short TTI transmission may have 17: (
) Length of binary digits, where each binary digit corresponds to an RBG. The eNB may broadcast the bitmap command within the cell as cell-specific information in a system information message. For example, the bitmap command may be carried by an Information Element (IE) of a RadioResourceConfigCommonSIB in system information block type 2(SIB 2). The definition of the bitmap command may be expressed as follows:
in this embodiment, it is assumed that the resources configured for short TTI transmissions are relatively few 4 RBGs, i.e., 12 VRBs/PRBs. The configured 12 VRBs may occupy a type 2 distributed resource configuration (N)gap＝Ngap1) The first 12 VRBs in (1), the resource allocation bitmap of which is as followsShown in the figure:
resourceBlockGroupAssignment＝[1,0,0,0,1,0,0,0,0,1,0,0,0,1,0,0,0]
as shown in FIG. 3, short TTI transmissions occupy VRBs numbered 0-11, which are mapped to PRBs (N)gap＝Ngap1) Shown in the left two columns in fig. 3. It should be noted that the purpose of aligning the resources configured for short TTI transmissions with existing type 2 distributed resource allocations is to ensure that the resource configuration for short TTI transmissions is compatible with existing resource configurations of each type (i.e. type 0, type 1 and type 2 with distributed and centralized resource allocations). Furthermore, to support localized and distributed resource configurations for short TTI transmission scheduling and at the same time be compatible with scheduling of ordinary TTI transmissions with existing resource configuration types, in the configured first resources the mapping of VRBs to PRBs may be localized or distributed and the distributed mapping may only coincide with the mapping in existing type 2 distributed resource allocations.
Once the resources for the short TTI transmission are configured, scheduling for the short TTI transmission will be restricted in the configured resources. Therefore, the resource allocation indication of the scheduling signaling (e.g., carried by a Physical Downlink Control Channel (PDCCH)) can also be based on the configured resources instead of the total carrier bandwidth, thereby being able to greatly reduce the signaling overhead. In this example, 1 binary bit may be utilized to indicate the type of VRB mapping (centralized or distributed) and another 4 binary bits may be utilized to indicate which VRB groups are used for data transmission, e.g., in resource allocation indication signaling. In this case, only 5 bits are sufficient for the resource allocation indication, whereas up to 17 bits are required for the resource allocations of type 0 and type 1 for the resource allocation over the entire 10MHz carrier bandwidth. Accordingly, signaling overhead for resource allocation can be greatly reduced.
Fig. 4 illustrates a schematic diagram of resource allocation for short TTI transmissions according to another embodiment of the present disclosure.
In the embodiment shown in fig. 4, the carrier bandwidth is assumed to be 10MHz (i.e., carrier bandwidth is 10 MHz)
) Then the RBG size is 3 as defined in the existing LTE-a system (as shown in table 1). In this case, the bitmap indicating resources configured for short TTI transmission may have 17: (
) Length of binary digits, where each binary digit corresponds to an RBG. The eNB may transmit the bitmap command to one or more UEs within the cell in a unicast or multicast manner. For example, the bitmap command may be carried by IE radioresourceconfigdetermined in an rrcconnectionsetup message, an rrcconnectionreeestassignment message, or an RRCConnectionReconfiguration message, or the like. The bitmap command may be defined in the same manner as the bitmap command described with respect to fig. 3.
In this embodiment, it is assumed that the resources configured for short TTI transmission are relatively many 8 RBGs, i.e., 24 VRBs/PRBs. The configured 24 VRBs may occupy a type 2 distributed resource configuration (N)gap＝Ngap1) The bitmap of resource allocation of the first 24 VRBs in (1) is as follows:
resourceBlockGroupAssignment＝[1,1,0,0,1,1,0,0,0,1,1,0,0,1,1,0,0]
as shown in FIG. 4, short TTI transmissions occupy VRBs numbered 0-23, which are mapped to PRBs (N)gap＝Ngap1) Shown in the left two columns in fig. 4. To support both localized and distributed resource configuration for short TTI transmission scheduling and at the same time be compatible with scheduling of ordinary TTI transmissions with existing resource configuration types, in the configured first resources the mapping of VRBs to PRBs may be localized or distributed and the distributed mapping may only coincide with the mapping in existing type 2 distributed resource allocations.
Once the resources for the short TTI transmission are configured, scheduling for the short TTI transmission will be restricted in the configured resources. Therefore, the resource allocation indication of the scheduling signaling can also be based on the configured resources instead of the total carrier bandwidth, thereby greatly reducing the signaling overhead. In this example, 1 binary bit may be utilized to indicate the type of VRB mapping (centralized or distributed) and another 8 binary bits may be utilized to indicate which VRB groups are used for data transmission, e.g., in resource allocation indication signaling. In this case, only 9 bits are sufficient for the resource allocation indication, whereas up to 17 bits are required for the resource allocations of type 0 and type 1 for the resource allocation over the entire 10MHz carrier bandwidth. Accordingly, signaling overhead for resource allocation can be greatly reduced.
Fig. 5 illustrates a schematic diagram of resource allocation for short TTI transmissions according to yet another embodiment of the present disclosure.
In the embodiment shown in fig. 5, it is assumed that the resources configured for short TTI transmission are 6 RBGs, i.e. 18 VRBs/PRB. The configured 18 VRBs may occupy a type 2 distributed resource configuration (N)gap＝Ngap2) The bitmap of its resource configuration is as follows (the definition of the bitmap may be the same as that described with respect to fig. 3):
resourceBlockGroupAssignment＝[0,0,0,0,0,0,1,1,1,1,1,1,0,0,0,0,0]
as shown in FIG. 5, short TTI transmissions occupy VRBs numbered 18-35 (i.e., the 18 last VRBs), their mapping to PRBs (Ngap＝Ngap2) Shown in columns 4-5 from the left in fig. 5. To support both localized and distributed resource configuration for short TTI transmission scheduling and at the same time be compatible with scheduling of ordinary TTI transmissions with existing resource configuration types, in the configured first resources the mapping of VRBs to PRBs may be localized or distributed and the distributed mapping may only coincide with the mapping in existing type 2 distributed resource allocations.
Once the resources for the short TTI transmission are configured, scheduling for the short TTI transmission will be restricted in the configured resources. Therefore, the resource allocation indication of the scheduling signaling can also be based on the configured resources instead of the total carrier bandwidth, thereby greatly reducing the signaling overhead. In this example, 1 binary bit may be utilized to indicate the type of VRB mapping (centralized or distributed) and another 6 binary bits may be utilized to indicate which VRB groups are used for data transmission, e.g., in resource allocation indication signaling. In this case, only 7 bits are sufficient for the resource allocation indication, whereas up to 17 bits are required for the resource allocations of type 0 and type 1 for the resource allocation over the entire 10MHz carrier bandwidth. Accordingly, signaling overhead for resource allocation can be greatly reduced.
Fig. 6 illustrates a schematic diagram of resource allocation for short TTI transmissions according to yet another embodiment of the present disclosure.
In the embodiment shown in fig. 6, it is assumed that the resources configured for short TTI transmission are 5 RBGs, i.e. 14 VRBs/PRB. The configured 14 VRBs may occupy resources other than those belonging to type 2 distributed resource configuration (N)gap＝Ngap2) The bitmap of the resource configuration of the PRBs other than the PRB of (a) is as follows (the bitmap may be defined in the same manner as the bitmap described with respect to fig. 3):
resourceBlockGroupAssignment＝[0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1]
as shown in FIG. 6, PRBs occupied by short TTI transmissions are shown in columns 4-5 from the left in FIG. 5.
Note that in this embodiment, since the configured resources are not the type 2 distributed resource configuration (N)gap＝Ngap1) Nor type 2 distributed resource configuration (N)gap＝Ngap2) Of the first resource, there may therefore be only one mapping from VRBs to PRBs, i.e. a localized mapping, in the configured first resource. In this case, only localized resource allocation for short TTI transmissions is supported. Thus, the 1 bit used to indicate the type of VRB mapping (centralized or distributed) can be set to a fixed value and the other 5 bits can be used to indicate which VRB groups are used for data transmission. In this case, only 6 bits are sufficient for the resource allocation indication, whereas up to 17 bits are required for the resource allocations of type 0 and type 1 for the resource allocation over the entire 10MHz carrier bandwidth. Accordingly, signaling overhead for resource allocation can be greatly reduced.
Fig. 7 illustrates a block diagram of an apparatus 700 for reducing transmission delay in accordance with an embodiment of the present disclosure. For example, the apparatus 700 may be implemented as or as part of an eNB in an LTE-a system. As shown in fig. 7, the apparatus 700 comprises a first resource configuration means 701 configured to configure a first resource for a first data transmission with control signaling, wherein the first data transmission has a short transmission time interval of less than 1 millisecond; and a first data transmission scheduling means 702 configured to schedule the first data transmission in the first resource in response to the first resource being configured.
In some embodiments, the first resource configuring means 701 is configured to configure the first resource by broadcasting cell-specific signaling within a cell, wherein the cell-specific signaling is embedded in broadcast system message signaling.
In some embodiments, the first resource configuring means 701 is configured to configure the first resource by using user equipment specific radio resource control signaling, wherein the radio resource control signaling is transmitted by any one of unicast and multicast.
In some embodiments, the first resource configuring device 701 is configured to configure the first resource by using physical layer dynamic control signaling, wherein a transmission manner of the physical layer dynamic control signaling is any one of the following: unicast, multicast, and broadcast.
In some embodiments, the basic unit of the first resource is any one of: a resource block; and a resource block group, wherein the resource block group includes a predetermined number of resource blocks.
In some embodiments, the first resource configuring means 701 is configured to configure the first resource with a resource block group as a basic unit by using a binary bitmap in the control signaling, where each binary bit in the binary bitmap corresponds to one resource block group.
In some embodiments, configuring the first resource in a basic unit of resource block groups with a binary bitmap in the control signaling comprises: using a binary bit of 1 in the binary bitmap to indicate that a corresponding resource block group belongs to the first resource; and using a bit of 0 in the binary bitmap to indicate that the corresponding resource block group does not belong to the first resource.
In some embodiments, the first resource configuring means 701 is configured to configure the first resource in a basic unit of resource blocks by using the control signaling, so that the first resource includes a first integer number or a last integer number of resource blocks in a distributed resource allocation type in a basic unit of resource blocks.
In some embodiments, the apparatus 700 further comprises a second data transmission scheduling means configured to schedule a second data transmission having a normal transmission time interval using a second resource, wherein the second resource is not configured for the first data transmission.
In some embodiments, the second data transmission scheduling apparatus is further configured to: scheduling the second data transmission using resources of the first resources not occupied by the first data transmission.
For clarity, certain optional features of the apparatus 700 are not shown in FIG. 7. However, it should be understood that the various features described above with reference to fig. 1-6 are equally applicable to the apparatus 700. Also, each means in the apparatus 700 may be a hardware module or a software module. For example, in some embodiments, device 700 may be implemented in part or in whole using software and/or firmware, e.g., as a computer program product embodied on a computer-readable medium. Alternatively or additionally, the device 700 may be implemented partly or entirely on hardware basis, e.g. as an Integrated Circuit (IC), an Application Specific Integrated Circuit (ASIC), a system on a chip (SOC), a Field Programmable Gate Array (FPGA), or the like. The scope of the present disclosure is not limited in this respect.
In summary, according to the embodiments of the present disclosure, a method and apparatus for reducing transmission delay are provided. The embodiment of the disclosure can realize resource allocation for short TTI transmission under the condition of being compatible with the existing resource allocation mode for common TTI transmission, and can effectively reduce the scheduling signaling overhead for short TTI transmission, thereby realizing the reduction of transmission delay.
In general, the various exemplary embodiments of this invention may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Certain aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device. While various aspects of the embodiments of the invention may be illustrated and described as block diagrams, flow charts, or using some other pictorial representation, it is well understood that the blocks, apparatus, systems, techniques or methods described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
Also, blocks in the flow diagrams may be viewed as method steps, and/or as operations that result from operation of computer program code, and/or as a plurality of coupled logic circuit elements understood to perform the associated functions. For example, embodiments of the invention include a computer program product comprising a computer program tangibly embodied on a machine-readable medium, the computer program comprising program code configured to implement the method described above.
Within the context of this disclosure, a machine-readable medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. The machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination thereof. More detailed examples of a machine-readable storage medium include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical storage device, a magnetic storage device, or any suitable combination thereof.
Computer program code for implementing the methods of the present invention may be written in one or more programming languages. These computer program codes may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program codes, when executed by the computer or other programmable data processing apparatus, cause the functions/acts specified in the flowchart and/or block diagram block or blocks to be performed. The program code may execute entirely on the computer, partly on the computer, as a stand-alone software package, partly on the computer and partly on a remote computer or entirely on the remote computer or server.
Additionally, while operations are depicted in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. In some cases, multitasking or parallel processing may be beneficial. Likewise, while the above discussion contains certain specific implementation details, this should not be construed as limiting the scope of any invention or claims, but rather as describing particular embodiments that may be directed to particular inventions. Certain features that are described in this specification in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable subcombination.
Various modifications, adaptations, and other embodiments of the present invention will become apparent to those skilled in the relevant arts in view of the foregoing description, when read in conjunction with the accompanying drawings. Any and all modifications will still fall within the scope of the non-limiting and exemplary embodiments of this invention. Furthermore, the foregoing description and drawings provide instructive benefits and other embodiments of the present invention set forth herein will occur to those skilled in the art to which these embodiments of the present invention pertain.
It is to be understood that the embodiments of the invention are not to be limited to the specific embodiments disclosed and that modifications and other embodiments are intended to be included within the scope of the appended claims. Although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (18)
1. A method for reducing transmission delay in a base station, comprising:
configuring a first resource for a first data transmission with control signaling, wherein the first data transmission has a short transmission time interval of less than 1 millisecond; and
scheduling the first data transmission in the first resource in response to the first resource being configured,
wherein configuring the first resource comprises:
configuring the first resources in a basic unit of resource block groups, a resource block group comprising a predetermined number of consecutive localized virtual resource blocks,
such that the first resource comprises a first integer number or a last integer number of resource blocks in a distributed resource allocation type in a basic unit of resource blocks, and
enabling resources of the first resources not occupied by the first data transmission to be used for a second data transmission having a normal transmission time interval.
2. The method of claim 1, wherein configuring the first resources for the first data transmission with control signaling comprises:
the first resource is configured by broadcasting cell-specific signaling within a cell.
3. The method of claim 2, wherein the cell-specific signaling is embedded in broadcast system message signaling.
4. The method of claim 1, wherein configuring the first resources for the first data transmission with control signaling comprises:
configuring the first resource with user equipment specific radio resource control signaling,
wherein the transmission mode of the radio resource control signaling is any one of unicast and multicast.
5. The method of claim 1, wherein configuring the first resources for the first data transmission with control signaling comprises:
configuring the first resource using physical layer dynamic control signaling,
wherein the transmission mode of the physical layer dynamic control signaling is any one of the following modes: unicast, multicast, and broadcast.
6. The method of claim 1, wherein configuring the first resource in a basic unit of resource block groups comprises:
configuring the first resource with a basic unit of resource block groups with a binary bitmap in the control signaling, wherein each binary bit in the binary bitmap corresponds to one resource block group.
7. The method of claim 6, wherein configuring the first resource in a basic unit of resource block groups with a binary bitmap in the control signaling comprises:
using a binary bit of 1 in the binary bitmap to indicate that a corresponding resource block group belongs to the first resource; and
utilizing a binary bit of 0 in the binary bitmap to indicate that the corresponding resource block group does not belong to the first resource.
8. The method of claim 1, further comprising:
scheduling the second data transmission utilizing second resources, wherein the second resources are not configured for the first data transmission.
9. The method of claim 8, further comprising:
scheduling the second data transmission using the resources of the first resources not occupied by the first data transmission.
10. An apparatus for reducing transmission delay, comprising:
a first resource configuration means configured to configure a first resource for a first data transmission with control signaling, wherein the first data transmission has a short transmission time interval of less than 1 millisecond; and
a first data transmission scheduling device configured to schedule the first data transmission in the first resource in response to the first resource being configured,
wherein the first resource configuration means is configured to:
configuring the first resources in a basic unit of resource block groups, a resource block group comprising a predetermined number of consecutive localized virtual resource blocks,
such that the first resource comprises a first integer number or a last integer number of resource blocks in a distributed resource allocation type in a basic unit of resource blocks, and
enabling resources of the first resources not occupied by the first data transmission to be used for a second data transmission having a normal transmission time interval.
11. The apparatus of claim 10, wherein the first resource configuration means is configured to:
the first resource is configured by broadcasting cell-specific signaling within a cell.
12. The apparatus of claim 11, wherein the cell-specific signaling is embedded in broadcast system message signaling.
13. The apparatus of claim 10, wherein the first resource configuration means is configured to:
configuring the first resource with user equipment specific radio resource control signaling,
wherein the transmission mode of the radio resource control signaling is any one of unicast and multicast.
14. The apparatus of claim 10, wherein the first resource configuration means is configured to:
configuring the first resource using physical layer dynamic control signaling,
wherein the transmission mode of the physical layer dynamic control signaling is any one of the following modes: unicast, multicast, and broadcast.
15. The apparatus of claim 10, wherein the first resource configuration means is configured to:
configuring the first resource with a basic unit of resource block groups with a binary bitmap in the control signaling, wherein each binary bit in the binary bitmap corresponds to one resource block group.
16. The apparatus of claim 15, wherein configuring the first resource in a basic unit of resource block groups with a binary bitmap in the control signaling comprises:
using a binary bit of 1 in the binary bitmap to indicate that a corresponding resource block group belongs to the first resource; and
utilizing a binary bit of 0 in the binary bitmap to indicate that the corresponding resource block group does not belong to the first resource.
17. The apparatus of claim 10, further comprising:
a second data transmission scheduling device configured to schedule the second data transmission using second resources, wherein the second resources are not configured for the first data transmission.
18. The apparatus of claim 17, wherein the second data transmission scheduling device is further configured to:
scheduling the second data transmission using the resources of the first resources not occupied by the first data transmission.
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| WO2019033229A1 (en) * | 2017-08-12 | 2019-02-21 | Nec Corporation | Methods and apparatuses for determining a phase tracking reference signal configuration parameter |
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| "Downlink control signaling overheads";LG Electronics;《3GPP TSG RAN WG1 #47bis R1-070243》;20070110;参见正文第2节 * |
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