Group-based transmission method and apparatus
Group-based precoding techniques optimize uplink transmission performance by aligning precoding with resource block groups, addressing varying frequency characteristics and enhancing communication efficiency.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- ZTE CORP
- Filing Date
- 2025-01-24
- Publication Date
- 2026-05-15
AI Technical Summary
Existing wireless communication systems face challenges in efficiently managing uplink transmissions due to varying frequency characteristics across different resource elements or blocks, leading to performance degradation.
Implementing group-based precoding techniques for different precoding resource block groups (PRGs) to optimize uplink transmission performance by configuring and indicating different precoding for each group, using methods such as TPMI fields for codebook-based transmissions and SRI fields for non-codebook-based transmissions.
Enhances uplink transmission performance by aligning precoding with group-based frequency resources, reducing interference, and optimizing antenna port usage, thereby improving overall communication efficiency.
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Figure CN2025074517_15052026_PF_FP_ABST
Abstract
Description
GROUP-BASED TRANSMISSION METHOD AND APPARATUSTECHNICAL FIELD
[0001] This document is directed generally to digital wireless communications.BACKGROUND
[0002] Mobile telecommunication technologies are moving the world toward an increasingly connected and networked society. In comparison with the existing wireless networks, next generation systems and wireless communication techniques will need to support a much wider range of use-case characteristics and provide a more complex and sophisticated range of access requirements and flexibilities.
[0003] Long-Term Evolution (LTE) is a standard for wireless communication for mobile devices and data terminals developed by the 3rd Generation Partnership Project (3GPP) . LTE Advanced (LTE-A) is a wireless communication standard that enhances the LTE standard. The 5th generation of wireless systems, known as 5G, advances the LTE and LTE-A wireless standards and is committed to supporting higher data rates, a larger number of connections, ultra-low latency, high reliability and other emerging business needs.SUMMARY
[0004] Techniques are disclosed for enabling or facilitating group-based transmissions.
[0005] In one exemplary aspect, a method of wireless communication performed at a communication device (e.g., a user equipment (UE) ) is disclosed. The method includes receiving, by the communication device from a network device (e.g., a base station (BS) , a network node, etc. ) , one or more messages related to a plurality of groups of frequency resources. The method further includes performing, by the communication device to the network device, a transmission based on the one or more messages.
[0006] In another exemplary aspect, a method of wireless communication performed at a network device (e.g., a BS, a network node, etc. ) is disclosed. The method includes transmitting, by the network device to a communication device (e.g., a UE) , one or more messages related to a plurality of groups of frequency resources. The method further includes receiving, by the network device from the communication device, a transmission based on the one or more messages.
[0007] In yet another exemplary aspect, the above-described methods are embodied in the form of processor-executable code and stored in a non-transitory computer-readable storage medium. The code included in the computer-readable storage medium, when executed by a processor, causes the processor to implement the methods described in this patent document.
[0008] In yet another exemplary embodiment, a device that is configured or operable to perform the above-described methods is disclosed. The device may include at least one processor configured to execute program code to cause the device to implement the above-described methods.
[0009] The above and other aspects and their implementations are described in greater detail in the drawings, the descriptions, and the claims.BRIEF DESCRIPTION OF THE DRAWINGS
[0010] FIG. 1 shows an example of a precoding resource block group (PRG) including consecutive physical resource blocks (PRBs) .
[0011] FIG. 2 shows an exemplary block diagram of a hardware platform that may be a part of a network device or a communication device.
[0012] FIG. 3 shows an example of wireless communication including a base station (BS) and user equipment (UE) based on some implementations of the disclosed technology.
[0013] FIG. 4 shows an exemplary flowchart for performing a wireless communication method.
[0014] FIG. 5 shows an exemplary flowchart for performing a wireless communication method.DETAILED DESCRIPTION
[0015] Wideband precoding can be indicated in an uplink transmission. But in some cases, such as where frequency character is quite different for different resource elements or resource blocks in a frequency domain, using wideband precoding can impact the performance of uplink transmission. Using different precoding for different precoding resource block groups (PRGs) can be an effective way to achieve better performance of an uplink transmission. Thus, this patent document describes techniques to describe or indicate the precoding for different PRGs.
[0016] The example headings for the various sections below are used to facilitate the understanding of the disclosed subject matter and do not limit the scope of the claimed subject matter in any way. Accordingly, one or more features of one example section can be combined with one or more features of another example section. Furthermore, 5G terminology is used for the sake of clarity of explanation, but the techniques disclosed in the present document are not limited to 5G technology only and may be used in wireless systems that implement other protocols.
[0017] I. Introduction
[0018] For uplink transmission, wideband precoding is indicated. For non-codebook-based transmission, different sounding reference signal (SRS) resources are configured and indicated to the UE. For codebook-based transmission, three transmission schemes are configured, and different precoding is indicated to the UE by a transmission precoding matrix indicator (TPMI) field. The precoder (or precoding) is indicated for full coherent, partial coherent or non-coherent codebook transmission.
[0019] Precoding for uplink transmission can be explained as the precoding or precoder or codebook for uplink transmission.
[0020] For uplink transmission, 2Tx / 3Tx / 4Tx or 8Tx can be configured or indicated for the UE, which may mean that the uplink transmission (e.g., physical uplink shared channel (PUSCH) ) can be transmitted based on 2 or 3 or 4 or 8 antenna ports, where which antenna port is used or which precoding is used is indicated by sounding reference signal resource indicator (SRI) or TPMI in a downlink control information (DCI) field.
[0021] For SRI for non-codebook-based uplink transmission, one SRS port is supported for one SRS resource, and which SRS resource is used is indicated by an SRI field.
[0022] For codebook-based transmission, a number of SRS ports is supported in one SRS resource, and one uplink transmission is associated with a number of SRS ports. The SRS ports and related precoder are indicated by the TPMI field.
[0023] For example, if the TPMI is indicated as this can mean that two layers are indicated as two columns in the precoder, and four antenna ports are supported in this case as the number of rows in each column, with each layer transmitted by one antenna port, which is indicated as 1. The precoder is used for the wideband uplink transmission. Full coherent or partial coherent or non-coherent is indicated with different precoders that may have different TPMI indexes. Different numbers of antenna ports can be configured, and indicated with different number of rows in the TPMI field.
[0024] PRG-based precoding is supported for downlink transmission. A UE may assume that precoding granularity is P′BWP, i consecutive resource blocks in the frequency domain, where P′BWP, i can be equal to one of the values among {2, 4, wideband} .
[0025] If P′BWP, i is determined to be “wideband, ” the UE is not expected to be scheduled with non-contiguous PRBs and the UE may assume that the same precoding is applied to the allocated resource associated with a same Transmission Configuration Indicator (TCI) state or a same Quasi-Co-Location (QCL) assumption.
[0026] If P′BWP, i is determined to be one of the values among {2, 4} , the PRG partitions the bandwidth part i with P′BWP, i consecutive PRBs. The actual number of consecutive PRBs in each PRG could be one or more.
[0027] The first PRG size is given by modP′BWP, i the last PRG size is given by modP′BWP, i if modP′BWP, i≠0, and the last PRG size is P′BWP, i if modP′BWP, i=0. For Physical Downlink Shared Channel (PDSCH) scheduled by Physical Downlink Control Channel (PDCCH) with DCI scrambled using Group Radio Network Temporary Identifier (G-RNTI) or Group Common Search Radio Network Temporary Identifier (G-CS-RNTI) , is the starting PRB of the CFR and is the CFR.
[0028] The UE may assume the same precoding is applied for any downlink contiguous allocation of PRBs in a PRG.
[0029] Various aspects of the disclosed techniques are described in the below captioned embodiments sections. These techniques may be used to define or indicate the precoders or SRS resources for different PRGs. These techniques are grouped under different embodiment headings for ease of explanation and techniques described in different embodiments may be combined in preferred implementations.
[0030] II. Embodiment #1
[0031] This section describes, among other things, how a UE may receive an indication from the network.
[0032] The UE receives an indication from a gNodeB (gNB) . The indication indicates an uplink transmission with group-based frequency resources.
[0033] For group-based uplink transmission, the frequency resource in each group can be determined according to at least one of:
[0034] ● Configured PRB or virtual resource block (VRB) number or size in one group. An example of a PRG including consecutive PRBs is shown in FIG. 1. In some examples, PRBs in one PRG use the same indicated precoder. Further, one PRG can comprise consecutive PRBs or non-consecutive PRBs.
[0035] ● Partial number of PRBs of scheduled number of PRBs. For example, when 100 PRBs are scheduled and two groups are supported, each group contains 50 PRBs. When four groups are supported, 25 PRBs are indicated in each group.
[0036] ● A number of PRBs in one band, an activated band, a bandwidth part, or an activated bandwidth part (for example, one or more bands or bandwidth parts are configured or activated) . For example, the UE is scheduled with a partial configured or activated band, and the group is determined according to the band or bandwidth part, or
[0037] ● At least one of: group length (the number of PRBs in one group) , the starting PRB, the ending PRB, or a reference point of the scheduled PRBs, the activated band, the bandwidth part, or the activated bandwidth part. The starting / ending PRB can be the starting / ending PRB of one group or of all the groups.
[0038] For a partial number of PRBs of a scheduled number of PRBs, consider two groups, for example. The scheduled number of PRBs is divided into two groups, and then the size of each group can be the same and can be half the number of scheduled PRBs. The PRBs in one group can be consecutive. In such case, the scheduled number of PRBs can be restricted as an even number or can be an integer times the group number.
[0039] In some cases, the scheduled number of PRBs is not limited, and the number of groups is indicated as an integer, e.g., two. Then if an odd number of PRBs are scheduled, the size of each group is no longer the same. A mapping rule should be defined or indicated, e.g., one group is mapping with a one-more PRB, and the other group is mapping with a one-less PRB. For example, if a total number of scheduled PRBs is N, and the number of groups is G, then the group size is floor (N / G) , and mod (N, G) groups can be of the size floor (N / G) +1 or ceil (N / G) . In other words, each of the (G-mod (N, G) ) groups has a group size of floor (N / G) , and each of the mod (N, G) groups has a group size of (floor (N / G) +1) or ceil (N / G) . In such case, the PRBs in each group can be consecutive.
[0040] In some cases, a number of UEs are co-scheduled. In order to keep lower interference from different UEs, the edges of the groups can be aligned for different UEs, i.e., one group from one UE should not be mapped across more than one group of other UEs. A same number of PRBs are co-scheduled for all co-scheduled UEs, and the groups can be configured with a start PRB and a length of one group.
[0041] Another method is to define the groups in the band or the bandwidth part. In such case, a first group is started from a common resource block in the band or the bandwidth part, and a number of groups are defined with a same size. All the co-scheduled UEs are with a same group configuration.
[0042] For example, for single Transmission / Reception Point (TRP) transmission, the PUSCH may be transmitted from one UE to one TRP, and the related uplink parameters, such as spatial relation, power control parameters, or SRS resource set, can be reused for all the configured groups. For example, one set of spatial relations, one set of power control parameters, and one set of SRS resources for reuse by all the configured groups is indicated to the UE.
[0043] In some cases, two or more SRS resource sets can also be configured to the UE. Each set is associated with one or more groups. The related SRS resources can be indicated to these groups by using a same SRI field that is associated with one SRS resource set.
[0044] III. Embodiment #2
[0045] This section discloses, among other things, scenarios associated with codebook-based uplink transmissions. In this section, a TPMI field may indicate one precoder.
[0046] For codebook-based uplink transmission, a precoder is used for uplink transmission, and one precoder can be used for a number of frequency resources. The frequency resources are associated with the scheduled bandwidth, the number of groups or the size of each group.
[0047] In this example, the precoder is indicated to one UE for codebook-based uplink transmission. For group-based uplink transmission, one precoder is used for one group. Additionally, the precoder should be indicated to a UE by using at least one of:
[0048] ● Precoding cycling
[0049] ○ Precoding selection, the following alternatives introduce different DCI overhead:
[0050] ■ Use legacy indication table.
[0051] ■ Use the same coherent type among these PRGs.
[0052] ● Precoding indication by using radio resource control (RRC) , medium access control-control element (MAC CE) or DCI signaling
[0053] ○ RRC configures the group size or the number of groups, and gNB indicates the related precoders by using TPMI fields.
[0054] ■ The first TPMI field indicates the precoder for the first group and the transmission rank or number of layers for all the groups.
[0055] ■ The other TPMI fields indicate the precoder for other groups from at least one of the following:
[0056] √ The precoders in these TPMI fields are from the candidate precoders of all the precoders with the same number of antenna ports and rank.
[0057] √ The precoders in these TPMI fields are from the candidate precoders of all the precoders with the same rank.
[0058] √ The precoders in these TPMI fields are from partial of the precoders with the same number of antenna ports and rank, where the partial precoders (candidate precoder) are from all the precoders with the same coherent type. For example, for 4Tx uplink transmission with two layers of transmission, a total number of 22 precoders are supported for one UE that is configured with full-partial-non-coherent codebook as shown in Table 2-1 below. But if the first group is indicated with a precoder with full coherent codebook, the other TPMI indicators can just indicate the full coherent type of precoders, i.e., 8 precoders and 3 bits, is enough for the precoding indication for each group.
[0059] √ The precoders in these TPMI fields are from partial of the precoders with the same number of antenna ports and rank (candidate precoders) , where the partial precoders are the precoders from the adjacent precoders of the indicated precoder of the first TPMI field or indicated for the first group. For example, if the first group is indicated with a precoder with index 9, the adjacent precoders can be used as the candidate precoders for other groups. For example, two precoders with smaller indexes and two precoders with larger indexes are used as the candidate precoders, and two bits are used to indicate one from the four adjacent precoders for one group. Similarly, the selected precoders can be more or less than 4, and also can be different numbers of smaller indexes and larger indexes, e.g., only two larger indexes are selected or one smaller index and one larger index, and 1 bit is used for one group except for the first group.
[0060] Table 2-1 TPMI indication for 4Tx with rank 2
[0061] √ The precoders in these TPMI fields are from partial of the precoders with the high correlation. Considering the phase or the channel on different frequency resources usually does not change drastically. Hence, the precoders associated with different groups have a relatively high correlation. E. g., precoder and for two different or adjacent groups of frequency resources.
[0062] √ A combination of the above methods, and the candidate precoders are selected from the same coherent type and the adjacent precoders.
[0063] IV. Embodiment #3
[0064] This section discloses, among other things, scenarios associated with non-codebook-based uplink transmissions. In this section, an SRI field may indicate one SRS resource.
[0065] For non-codebook-based uplink transmission, an SRI field is used for the related SRS resource indication.
[0066] For group-based uplink transmission, different SRS resources may be used for different groups.
[0067] For the group determination, except for the above methods, one more new method may be used, i.e., associated with the downlink PRG. For uplink channel measurement with SRS, the association between downlink PRG and uplink PRG can be determined, the same size or N times of downlink PRG. And the edge of the uplink group should be aligned with one of downlink PRG for Time Division Duplexing (TDD) mode.
[0068] For the SRI indication, the following mode can be used:
[0069] ● ‘one-one’ mode, where multiple SRI fields are used for the uplink group indication. One SRI field can be used to indicate the related SRS resources for one group.
[0070] ○ The first SRI field indicates the SRS resources for the first group and the transmission rank or number of layers for all the groups.
[0071] ○ The other SRI fields are to indicate the SRS resources for other groups from at least one of the following:
[0072] ■ The SRS resources in these SRI fields are from all the SRS resources with the same number of SRS resources and rank of the first indicated SRI field.
[0073] ■ The SRS resources in these SRI fields are from all the SRS resources with the same rank of the first indicated SRI field.
[0074] ■ The SRS resources in these SRI fields are from partial of the SRS resources with the same number of SRS resources and rank of the first indicated SRI field, where the partial SRS resources are from all the SRS resources with the same number of SRS resources of the first indicated SRI field. For example, for 4Tx uplink transmission with two layers of transmission, a total number of 15 entries for SRI indication are supported for one UE that is configured with 3 SRS resources, but if the first group is indicated with 4 bits SRI indication, the other SRI indicators can just indicate the same number of SRS resources, and fewer bits are needed.
[0075] ■ The SRS resources in these SRI fields are a part of the SRS resources with the same number of SRS resources and rank of the first indicated SRI field, where the part of SRS resources are adjacent SRS resources or SRS resources from an adjacent SRS resource indicator of the first SRI field or indicated for the first group. For example, if the first group is indicated with SRS resources with index 9, the adjacent SRS resources or the SRS resources from the adjacent SRS resource indicator (e.g., SRS resources with index 8 of the first indicator field) can be used as the candidate SRS resources for other groups. For example, two entries of SRS resources with smaller SRS resource indexes or SRS resources with smaller SRS resource indicator indexes and entries of SRS resources with larger indexes or SRS resources with larger SRS resource indicator indexes are used as the candidate SRS resources, and two bits are used to indicate one from the four adjacent SRS resources for one group. Similarly, the selected SRS resources can be more or less than 4, and also can be different numbers of smaller indexes and larger indexes, e.g., only two larger indexes are selected or one smaller index and one larger index, and 1 bit is used for one group except for the first group.
[0076] ■ The SRS resources with the high correlation. Considering the phase or the channel on different frequency resources usually does not change drastically. Hence, the SRS resources associated with different groups have a relatively high correlation. For example, SRS resources (0, 1, 2) and (0, 1, 3) may be for two different or adjacent groups of frequency resources.
[0077] ■ A combination of the above methods, where the candidate SRS resources are selected from the same number of SRS resources and the adjacent entries of SRS resources. The adjacent SRS resources can be the SRS resource with a configured SRS resource index or the SRS resource with an adjacent index of SRI to the first SRI field.
[0078] V. Embodiment #4
[0079] This section discloses, among other things, how a TPMI field indicates two or more precoders and how an SRI field indicates two or more SRS resources.
[0080] For codebook-based uplink transmission or non-codebook-based transmission, one TPMI field or SRI field is used to indicate the related precoders or SRS resources for plurality groups.
[0081] In such case, a number of TPMI or SRS resource pairs / sets / groups can be configured or predefined. A list of pairs can be configured by RRC. For example, in Table 2-1 above, if two groups are configured, the precoding in this table can be indicated as a precoder pair / set / group, such as pair / set / group1 with precoder {1, 2} and pair / set / group2 with precoder {1, 3} . Additionally, a number of pairs / sets / groups can be configured by RRC.
[0082] The indication of these precoders can be considered as follows:
[0083] ● One pair / set / group is indicated by DCI. For example, about 32 pairs / sets / groups are configured by RRC, and a 5-bit DCI is used to indicate which pair / set / group is used for the related groups. For example, the first precoder in the pair / set / group is used to indicate the groups of PRBs with lower index, e.g., the first group of frequency resources.
[0084] ● A plurality of pairs / sets / groups are activated by MAC CE, and one pair / set / group is indicated by DCI. For example, about 32 pairs / sets / groups are configured by RRC, only 8 of them are activated by MAC CE, and a 3-bit DCI is used to indicate which pair / set / group in the activated pairs / sets / groups is used for the related groups.
[0085] SRI indication is similar to the TPMI indication introduced above.
[0086] A number of pairs / sets / groups of SRS resources are configured for the uplink transmission. For example, for an uplink transmission with four SRS resources that are configured in one SRS resource set, for one group of frequency resources a number of SRS resources are indicated, e.g., SRS resource (1, 2, 3) . At least one group of SRS resources can be configured, including a number of SRS resources for a plurality of frequency resources. For example, one group of SRS resources includes a number of SRS resources, such as SRS resource sub-group #1 with SRS resource (0, 1, 2) for the first group of frequency resources, and sub-group #2 with SRS resource (0, 1, 3) for the second group of frequency resources, etc. In one group of SRS resources, at least one sub-group of SRS resources is configured. Another way to define one sub-group is to associate the sub-group with one SRS resource indicator. Accordingly, a group of SRS resources comprise a number of SRS resource indicators.
[0087] The indication of these SRS resources can be performed as follows:
[0088] ● One group is indicated by DCI. For example, about 32 groups are configured by RRC, and a 5-bit DCI is used to indicate which group is used for the related groups. For example, the first SRS resource group is used to indicate the groups of PRBs with lower index.
[0089] ● A plurality of groups is activated by MAC CE, and one group is indicated by DCI.
[0090] For example, about 32 groups are configured by RRC, only 8 of them are activated by MAC CE, and a 3-bit DCI is used to indicate which group is used for the related frequency resource groups.
[0091] In the above indication, any one of RRC, MAC CE or DCI is not integral.
[0092] Another way of using one TPMI field or SRI field to indicate the related precoders or SRS resources is to just use the TPMI or SRI field to indicate the related parameters of the first group, e.g., the group of PRBs with lowest indexes. And the other precoders or SRS resources are indicated by using cyclic indication from a set of precoders or SRS resources. The set of precoders or SRS resources can be selected in a manner similar to that introduced in embodiment 2 or 3, such as the same coherent type with the first indicated precoder in the first TPMI field, or the adjacent one or more precoders of the first indicated precoder in the first TPMI field, or the same number of SRS resources with a first group of the indicated SRI field, or adjacent one or more entries of the first indicated SRI.
[0093] In additional cases involving the above embodiments, the uplink with 2 antenna ports, 4 antenna ports, 8 antenna ports or even more antenna ports can also be used based on the above indication methods.
[0094] VI. Example technologies
[0095] This section describes example techniques that are described in this patent document.
[0096] FIG. 2 shows an exemplary block diagram of a hardware platform 200 that may be a part of a network device (e.g., base station) or a communication device (e.g., a user equipment (UE) ) . The hardware platform 200 includes at least one processor 210 and a memory 205 having instructions stored thereupon. The instructions upon execution by the processor 210 configure the hardware platform 200 to perform the operations described in FIGS. 4-5 and in the various embodiments described in this patent document. A transmitter 215 transmits or sends information or data to another device. For example, a network device transmitter can send a message to a user equipment. A receiver 220 receives information or data transmitted or sent by another device. For example, a user equipment can receive a message from a network device.
[0097] The implementations as discussed above will apply to a wireless communication. FIG. 3 shows an example of a wireless communication system (e.g., a 5G or New Radio (NR) cellular network) that includes a BS 320 and one or more UEs 311, 312 and 313. In some embodiments, the UEs access the BS (e.g., the network) using a communication link to the network (sometimes called uplink direction, as depicted by dashed arrows 331, 332, 333) , which then enables subsequent communication (e.g., shown in the direction from the network to the UEs, sometimes called downlink direction, shown by arrows 341, 342, 343) from the BS to the UEs. In some embodiments, the BS sends information to the UEs (sometimes called downlink direction, as depicted by arrows 341, 342, 343) , which then enables subsequent communication (e.g., shown in the direction from the UEs to the BS, sometimes called uplink direction, shown by dashed arrows 331, 332, 333) from the UEs to the BS. The UE may be, for example, a smartphone, a tablet, a mobile computer, a machine to machine (M2M) device, an Internet of Things (IoT) device, and so on.
[0098] VII. Examples of preferred embodiments
[0099] FIG. 4 shows an exemplary flowchart for performing a wireless communication method. Operation 402 includes receiving, by a communication device from a network device, one or more messages related to a plurality of groups of frequency resources. Operation 404 includes performing, by the communication device to the network device, a transmission based on the one or more messages. The following techniques may be adopted by preferred embodiments.
[0100] In some embodiments, the plurality of groups of frequency resources share at least one of a set of spatial relation parameters, a set of power control parameters, or a set of SRS resources.
[0101] In some embodiments, each frequency resource from the plurality of groups of frequency resources is a PRB or a VRB.
[0102] In some embodiments, the one or more messages comprise at least one SRI field designating the set of SRS resources associated with the plurality of groups of frequency resources.
[0103] In some embodiments, the one or more messages indicate that each of the plurality of groups of frequency resources comprises 2, 4, 8, 12, 16, 24, 26, 48, 52, 136, or 138 frequency resources.
[0104] In some embodiments, the one or more messages indicate a number of groups of frequency resources and a number of scheduled, predefined, or activated frequency resources. A number of frequency resources in each group of frequency resources is determined based on the number of groups of frequency resources and the number of scheduled, predefined, or activated frequency resources.
[0105] In some embodiments, the one or more messages indicate a designated frequency resource for the plurality of groups of frequency resources, and the plurality of frequency resources in each group of frequency resources is determined based on the number of frequency resources in the group of frequency resources and the designated frequency resource.
[0106] In some embodiments, the designated frequency resource for the plurality of groups of frequency resources is a first or a last PRB of one or all of the plurality of groups of frequency resources.
[0107] In some embodiments, the one or more messages indicate that each of G groups of frequency resources includes (N / G) frequency resources. G represents the number of groups of frequency resources, and N represents the number of scheduled, predefined, or activated frequency resources, where N / G is an integer.
[0108] In some embodiments, the one or more messages indicate that each of first (G-mod (N / G) ) groups of frequency resources comprises floor (N / G) PRBs, and each of second mod (N / G) groups of frequency resources comprises ceil (N / G) PRBs, wherein the one or more messages comprise a mapping rule that designates the first (G-mod (N / G) ) groups of frequency resources and the second mod (N / G) groups of frequency resources, and wherein G represents the number of groups of frequency resources, N represents the number of scheduled or activated frequency resources, N / G is not an integer, floor (N / G) represents a greatest integer that is no greater than (N / G) , mod (N / G) is a remainder of a division of N by G, and ceil (N / G) represents a smallest integer that is no smaller than (N / G) .
[0109] In some embodiments, the one or more messages comprise a first TPMI field indicating one or more precoders and a transmission rank for each group of frequency resources. The one or more messages comprise one or more additional TPMI fields each indicating one or more additional precoders, each of the one or more additional precoders having a same number of antenna ports and a same transmission rank as the one or more precoders. Each of the one or more precoders and the one or more additional precoders corresponds to one of the plurality of groups of frequency resources.
[0110] In some embodiments, each of the one or more additional precoders has a same coherent type, a same number of antenna ports, or same antenna ports as the one or more precoders.
[0111] In some embodiments, the one or more additional precoders are adjacent to the one or more precoders.
[0112] In some embodiments, the one or more additional precoders comprise at least one of: a same precoder as one of the one or more precoders indicated in the first TPMI field; an Xth precoder adjacent to the one or more precoders with a lower index than the one or more precoders indicated by the first TPMI field; an Xth precoder adjacent to the one or more precoders with a larger index than the one or more precoders indicated by the first TPMI field; or an Xth precoder adjacent to a designated one of the one or more precoders indicated by the first TPMI field, where X is an integer.
[0113] In some embodiments, each of the first TPMI field and the one or more additional TPMI fields corresponds to a same number of precoders.
[0114] In some embodiments, each of the one or more precoders is designated by a first number of bits in the first TPMI field, wherein each of the one or more additional precoders is designated by a second number of bits in one of the one or more additional TPMI fields, the first number being greater than the second number.
[0115] In some embodiments, the one or more messages comprise at least one of: a first message that configures a plurality of sets of precoders, each precoder in each set of precoders being associated with a group of frequency resources of the plurality of groups of frequency resources; a second message that activates one or more sets of precoders of the plurality of sets of precoders; or a third message that indicates at least one set of precoders of the plurality of sets of precoders.
[0116] In some embodiments, the at least one set of precoders indicated by the third message is activated by the second message.
[0117] In some embodiments, the one or more messages comprise a first SRI field indicating one or more SRS resources and a transmission rank for each group of frequency resources. The one or more messages comprise one or more additional SRI fields each indicating one or more additional SRS resources, each of the one or more additional SRS resources having a same number of antenna ports and a same transmission rank as the one or more SRS resources. Each of the one or more SRS resources and the one or more additional SRS resources corresponds to one of the plurality of groups of frequency resources.
[0118] In some embodiments, each of the first SRI field and the one or more additional SRI fields corresponds to a same number of SRS resources.
[0119] In some embodiments, the one or more additional SRS resources are adjacent to the one or more SRS resources.
[0120] In some embodiments, the one or more additional SRS resources comprise at least one of: a same SRS resource as one of the one or more SRS resources indicated in the first SRI field; an Xth SRS resource adjacent to the one or more SRS resources with a lower index than the one or more SRS resources indicated by the first SRI field; an Xth SRS resource adjacent to the one or more SRS resources with a larger index than the one or more SRS resources indicated by the first SRI field; or an Xth SRS resource adjacent to a designated one of the one or more SRS resources indicated by the first SRI field, where X is an integer.
[0121] In some embodiments, each of the one or more SRS resources is designated by a first number of bits in the first SRI field. Each of the one or more additional SRS resources is designated by a second number of bits in one of the one or more additional SRI fields, the first number being greater than the second number.
[0122] In some embodiments, the one or more messages comprise at least one of: a first message that configures a plurality of groups of SRS resources, each SRS resource in each group of SRS resources being associated with a group of frequency resources of the plurality of groups of frequency resources; a second message that activates one or more groups of SRS resources of the plurality of groups of SRS resources; or a third message that indicates at least one group of SRS resources of the plurality of groups of SRS resources.
[0123] In some embodiments, the at least one group of SRS resources indicated by the third message is activated by the second message.
[0124] In some embodiments, the first message is an RRC message, the second message is a MAC CE message, and the third message is a DCI message.
[0125] In some embodiments, the transmission is an uplink transmission.
[0126] FIG. 5 shows an exemplary flowchart for performing a wireless communication method. Operation 502 includes transmitting, by a network device to a communication device, one or more messages related to a plurality of groups of frequency resources. Operation 504 includes receiving, by the network device from the communication device, a transmission based on the one or more messages.
[0127] In some embodiments, the plurality of groups of frequency resources shares at least one of a set of spatial relation parameters, a set of power control parameters, or a set of SRS resources.
[0128] In some embodiments, each frequency resource from the plurality of groups of frequency resources is a PRB or a VRB.
[0129] In some embodiments, the one or more messages comprise at least one SRI field designating the set of SRS resources associated with the plurality of groups of frequency resources.
[0130] In some embodiments, the one or more messages indicate that each of the plurality of groups of frequency resources comprises 2, 4, 8, 12, 16, 24, 26, 48, 52, 136, or 138 frequency resources.
[0131] In some embodiments, the one or more messages indicate a number of groups of frequency resources and a number of scheduled, predefined, or activated frequency resources. A number of frequency resources in each group of frequency resources is determined based on the number of groups of frequency resources and the number of scheduled, predefined, or activated frequency resources.
[0132] In some embodiments, the one or more messages indicate a designated frequency resource for the plurality of groups of frequency resources, and the plurality of frequency resources in each group of frequency resources is determined based on the number of frequency resources in the group of frequency resources and the designated frequency resource.
[0133] In some embodiments, the designated frequency resource for the plurality of groups of frequency resources is a first or a last PRB of one or all of the plurality of groups of frequency resources.
[0134] In some embodiments, the one or more messages indicate that each of G groups of frequency resources includes (N / G) frequency resources, where G represents the number of groups of frequency resources, N represents the number of scheduled, predefined, or activated frequency resources, and N / G is an integer.
[0135] In some embodiments, the one or more messages indicate that each of first (G-mod (N / G) ) groups of frequency resources comprises floor (N / G) PRBs, and each of second mod (N / G) groups of frequency resources comprises ceil (N / G) PRBs, wherein the one or more messages comprise a mapping rule that designates the first (G-mod (N / G) ) groups of frequency resources and the second mod (N / G) groups of frequency resources, and wherein G represents the number of groups of frequency resources, N represents the number of scheduled or activated frequency resources, N / G is not an integer, floor (N / G) represents a greatest integer that is no greater than (N / G) , mod (N / G) is a remainder of a division of N by G, and ceil (N / G) represents a smallest integer that is no smaller than (N / G) .
[0136] In some embodiments, the one or more messages comprise a first TPMI field indicating one or more precoders and a transmission rank for each group of frequency resources. The one or more messages comprise one or more additional TPMI fields each indicating one or more additional precoders, each of the one or more additional precoders having a same number of antenna ports and a same transmission rank as the one or more precoders. Each of the one or more precoders and the one or more additional precoders corresponds to one of the plurality of groups of frequency resources.
[0137] In some embodiments, each of the one or more additional precoders has a same coherent type, a same number of antenna ports, or same antenna ports as the one or more precoders.
[0138] In some embodiments, the one or more additional precoders are adjacent to the one or more precoders.
[0139] In some embodiments, the one or more additional precoders comprise at least one of: a same precoder as one of the one or more precoders indicated in the first TPMI field; an Xth precoder adjacent to the one or more precoders with a lower index than the one or more precoders indicated by the first TPMI field; an Xth precoder adjacent to the one or more precoders with a larger index than the one or more precoders indicated by the first TPMI field; or an Xth precoder adjacent to a designated one of the one or more precoders indicated by the first TPMI field, where X is an integer.
[0140] In some embodiments, each of the first TPMI field and the one or more additional TPMI fields corresponds to a same number of precoders.
[0141] In some embodiments, each of the one or more precoders is designated by a first number of bits in the first TPMI field, wherein each of the one or more additional precoders is designated by a second number of bits in one of the one or more additional TPMI fields, the first number being greater than the second number.
[0142] In some embodiments, the one or more messages comprise at least one of: a first message that configures a plurality of sets of precoders, each precoder in each set of precoders being associated with a group of frequency resources of the plurality of groups of frequency resources; a second message that activates one or more sets of precoders of the plurality of sets of precoders; or a third message that indicates at least one set of precoders of the plurality of sets of precoders.
[0143] In some embodiments, the at least one set of precoders indicated by the third message is activated by the second message.
[0144] In some embodiments, the one or more messages comprise a first SRI field indicating one or more SRS resources and a transmission rank for each group of frequency resources. The one or more messages comprise one or more additional SRI fields each indicating one or more additional SRS resources, each of the one or more additional SRS resources having a same number of antenna ports and a same transmission rank as the one or more SRS resources. Each of the one or more SRS resources and the one or more additional SRS resources corresponds to one of the plurality of groups of frequency resources.
[0145] In some embodiments, each of the first SRI field and the one or more additional SRI fields corresponds to a same number of SRS resources.
[0146] In some embodiments, the one or more additional SRS resources are adjacent to the one or more SRS resources.
[0147] In some embodiments, the one or more additional SRS resources comprise at least one of: a same SRS resource as one of the one or more SRS resources indicated in the first SRI field; an Xth SRS resource adjacent to the one or more SRS resources with a lower index than the one or more SRS resources indicated by the first SRI field; an Xth SRS resource adjacent to the one or more SRS resources with a larger index than the one or more SRS resources indicated by the first SRI field; or an Xth SRS resource adjacent to a designated one of the one or more SRS resources indicated by the first SRI field, where X is an integer.
[0148] In some embodiments, each of the one or more SRS resources is designated by a first number of bits in the first SRI field. Each of the one or more additional SRS resources is designated by a second number of bits in one of the one or more additional SRI fields, the first number being greater than the second number.
[0149] In some embodiments, the one or more messages comprise at least one of: a first message that configures a plurality of groups of SRS resources, each SRS resource in each group of SRS resources being associated with a group of frequency resources of the plurality of groups of frequency resources; a second message that activates one or more groups of SRS resources of the plurality of groups of SRS resources; or a third message that indicates at least one group of SRS resources of the plurality of groups of SRS resources.
[0150] In some embodiments, the at least one group of SRS resources indicated by the third message is activated by the second message.
[0151] In some embodiments, the first message is an RRC message, the second message is a MAC CE message, and the third message is a DCI message.
[0152] In some embodiments, the transmission is an uplink transmission.
[0153] In this document the term “exemplary” is used to mean “an example of” and, unless otherwise stated, does not imply an ideal or a preferred embodiment.
[0154] VIII. Concluding remarks
[0155] It will be appreciated by those of skill in the art that the present document discloses various techniques enabling or facilitating group-based transmissions.
[0156] In some examples, the disclosed technologies define the frequency resources of the groups, such as group size, group number, or the group’s position.
[0157] A UE receives an indication from a gNB. The indication indicates an uplink transmission with group-based frequency resources.
[0158] All the uplink groups are associated with at least one of:
[0159] ● One same set of spatial relation parameters;
[0160] ● One same set of power control parameters; or
[0161] ● One same SRS resource set.
[0162] For group-based uplink transmission, the frequency resource in each group can be determined according to at least one of:
[0163] ● Configured PRB or VRB number or size in one group;
[0164] ● Partial number of PRBs of scheduled number of PRBs;
[0165] ● A number of PRBs in one band, or an activated band, or a bandwidth part, or activated bandwidth part; or
[0166] ● At least one of: group length (the number of PRBs in one group) , the starting PRB or the ending PRB, where the starting / ending PRB can be the starting / ending PRB of one group or of all the groups.
[0167] The size of each group can be the same and should be half the number of scheduled PRBs. The PRBs in one group can be consecutive. In some examples, the scheduled number of PRBs can be restricted to be an even number or an integer times the group number.
[0168] One group is mapping with a one-more PRB, and the other group is mapping with a one-less PRB. For example, if a total number of scheduled PRBs is N, and the number of groups is G, then the group size is floor (N / G) , and mod (N, G) groups can be of the size floor (N / G) +1 or ceil (N / G) . In other words, each of the (G-mod (N, G) ) groups has a group size of floor (N / G) , and each of the mod (N, G) groups has a group size of (floor (N / G) +1) or ceil (N / G) . In such case, the PRBs in each group are consecutive.
[0169] One group from one UE may not be mapped across more than one group of other UEs.
[0170] The disclosed technologies define groups in the band or the bandwidth part. In such case, a first group is started from a common resource block in the band or the bandwidth part, and a number of groups are defined with a same size. All the co-scheduled UEs are with a same group configuration.
[0171] In some examples, the disclosed technologies use X TPMI fields or X SRI fields to indicate the precoders or SRS resources of X groups for contention-based (CB) - / non-CB-based transmission, where X is a positive integer.
[0172] In some examples, the disclosed technologies use one TPMI field or one SRI field to indicate the precoders or SRS resources of X groups for CB- / non-CB-based transmission, where X is a positive integer greater than 1.
[0173] Some of the embodiments described herein are described in the general context of methods or processes, which may be implemented in one embodiment by a computer program product, embodied in a computer-readable medium, included in computer-executable instructions, such as program code, or executed by computers in networked environments. A computer-readable medium may include removable and non-removable storage devices including, but not limited to, Read Only Memory (ROM) , Random Access Memory (RAM) , compact discs (CDs) , digital versatile discs (DVD) , etc. Therefore, the computer-readable media can include a non-transitory storage media. Generally, program modules may include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. Computer-or processor-executable instructions, associated data structures, and program modules represent examples of program code for executing steps of the methods disclosed herein. The particular sequence of such executable instructions or associated data structures represents examples of corresponding acts for implementing the functions described in such steps or processes.
[0174] Some of the disclosed embodiments can be implemented as devices or modules using hardware circuits, software, or combinations thereof. For example, a hardware circuit implementation can include discrete analog and / or digital components that are, for example, integrated as part of a printed circuit board. Alternatively, or additionally, the disclosed components or modules can be implemented as an Application Specific Integrated Circuit (ASIC) and / or as a Field Programmable Gate Array (FPGA) device. Some implementations may additionally or alternatively include a digital signal processor (DSP) that is a specialized microprocessor with an architecture optimized for the operational needs of digital signal processing associated with the disclosed functionalities of this application. Similarly, the various components or sub-components within each module may be implemented in software, hardware or firmware. The connectivity between the modules and / or components within the modules may be provided using any one of the connectivity methods and media that is known in the art, including, but not limited to, communications over the Internet, wired, or wireless networks using the appropriate protocols.
[0175] While this document contains many specifics, these should not be construed as limitations on the scope of an invention that is claimed or of what may be claimed, but rather as descriptions of features specific to particular embodiments. Certain features that are described in this document 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 sub-combination. Moreover, although features may be described above as acting in certain combinations and even initially claimed as such, one or more features from a claimed combination can in some cases be excised from the combination, and the claimed combination may be directed to a sub-combination or a variation of a sub-combination. Similarly, while operations are depicted in the drawings 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.
[0176] Only a few implementations and examples are described and other implementations, enhancements and variations can be made based on what is described and illustrated in this disclosure.
Claims
1.A wireless communication method, comprising:receiving, by a communication device from a network device, one or more messages related to a plurality of groups of frequency resources; andperforming, by the communication device to the network device, a transmission based on the one or more messages.2.A wireless communication method, comprising:transmitting, by a network device to a communication device, one or more messages related to a plurality of groups of frequency resources; andreceiving, by the network device from the communication device, a transmission based on the one or more messages.3.The wireless communication method of claim 1 or 2, wherein the plurality of groups of frequency resources shares at least one of a set of spatial relation parameters, a set of power control parameters, or a set of sounding reference signal (SRS) resources.4.The wireless communication method of claim 3, wherein each frequency resource from the plurality of groups of frequency resources is a physical resource block (PRB) or a virtual resource block (VRB) .5.The wireless communication method of claim 3 or 4, wherein the one or more messages comprise at least one SRS resource indicator (SRI) field designating the set of SRS resources associated with the plurality of groups of frequency resources.6.The wireless communication method of claim 4 or 5, wherein the one or more messages indicate each of the plurality of groups of frequency resources comprises 2, 4, 8, 12, 16, 24, 26, 48, 52, 136, or 138 frequency resources.7.The wireless communication method of claim 4 or 5, wherein the one or more messages indicate a number of groups of frequency resources and a number of scheduled, predefined, or activated frequency resources, and wherein a number of frequency resources in each group of frequency resources is determined based on the number of groups of frequency resources and the number of scheduled, predefined, or activated frequency resources.8.The wireless communication method of claim 6 or 7, wherein the one or more messages indicate a designated frequency resource for the plurality of groups of frequency resources, and the plurality of frequency resources in each group of frequency resources is determined based on the number of frequency resources in the group of frequency resources and the designated frequency resource.9.The wireless communication method of claim 8, wherein the designated frequency resource for the plurality of groups of frequency resources is a first or a last PRB of one or all of the plurality of groups of frequency resources.10.The wireless communication method of claim 7, wherein the one or more messages indicate that each of G groups of frequency resources includes (N / G) frequency resources, and wherein G represents the number of groups of frequency resources, and N represents the number of scheduled, predefined, or activated frequency resources, and wherein N / G is an integer.11.The wireless communication method of claim 7, wherein the one or more messages indicate that each of first (G-mod (N / G) ) groups of frequency resources comprises floor (N / G) PRBs, and each of second mod (N / G) groups of frequency resources comprises ceil (N / G) PRBs, wherein the one or more messages comprise a mapping rule that designates the first (G-mod (N / G) ) groups of frequency resources and the second mod (N / G) groups of frequency resources, and wherein G represents the number of groups of frequency resources, N represents the number of scheduled or activated frequency resources, N / G is not an integer, floor (N / G) represents a greatest integer that is no greater than (N / G) , mod (N / G) is a remainder of a division of N by G, and ceil (N / G) represents a smallest integer that is no smaller than (N / G) .12.The wireless communication method of any of claims 1-11, wherein the one or more messages comprise a first Transmission Precoding Matrix Indicator (TPMI) field indicating one or more precoders and a transmission rank for each group of frequency resources, wherein the one or more messages comprise one or more additional TPMI fields each indicating one or more additional precoders, each of the one or more additional precoders having a same number of antenna ports and a same transmission rank as the one or more precoders, and wherein each of the one or more precoders and the one or more additional precoders corresponds to one of the plurality of groups of frequency resources.13.The wireless communication method of claim 12, wherein each of the one or more additional precoders has a same coherent type, a same number of antenna ports, or same antenna ports as the one or more precoders.14.The wireless communication method of claim 12, wherein the one or more additional precoders are adjacent to the one or more precoders.15.The wireless communication method of 14, wherein the one or more additional precoders comprise at least one of:a same precoder as one of the one or more precoder indicated in the first TPMI field;an Xth precoder adjacent to the one or more precoders with a lower index than the one or more precoders indicated by the first TPMI field;an Xth precoder adjacent to the one or more precoders with a larger index than the one or more precoders indicated by the first TPMI field; oran Xth precoder adjacent to a designated one of the one or more precoders indicated by the first TPMI field, and wherein X is an integer.16.The wireless communication method of any of claims 12-15, wherein each of the first TPMI field and the one or more additional TPMI fields corresponds to a same number of precoders.17.The wireless communication method of claim 12, wherein each of the one or more precoders is designated by a first number of bits in the first TPMI field, wherein each of the one or more additional precoders is designated by a second number of bits in one of the one or more additional TPMI fields, the first number being greater than the second number.18.The wireless communication method of any of claims 1-11, wherein the one or more messages comprise at least one of:a first message that configures a plurality of sets of precoders, each precoder in each set of precoders being associated with a group of frequency resources of the plurality of groups of frequency resources;a second message that activates one or more sets of precoders of the plurality of sets of precoders; ora third message that indicates at least one set of precoders of the plurality of sets of precoders.19.The wireless communication method of claim 18, wherein the at least one set of precoders indicated by the third message is activated by the second message.20.The wireless communication method of any of claims 1-11, wherein the one or more messages comprise a first SRI field indicating one or more SRS resources and a transmission rank for each group of frequency resources, wherein the one or more messages comprise one or more additional SRI fields each indicating one or more additional SRS resources, each of the one or more additional SRS resources having a same number of antenna ports and a same transmission rank as the one or more SRS resources, and wherein each of the one or more SRS resources and the one or more additional SRS resources corresponds to one of the plurality of groups of frequency resources.21.The wireless communication method of claim 20, wherein each of the first SRI field and the one or more additional SRI fields corresponds to a same number of SRS resources.22.The wireless communication method of claim 20, wherein the one or more additional SRS resources are adjacent to the one or more SRS resources.23.The wireless communication method of 22, wherein the one or more additional SRS resources comprise at least one of:a same SRS resource as one of the one or more SRS resources indicated in the first SRI field;an Xth SRS resource adjacent to the one or more SRS resources with a lower index than the one or more SRS resources indicated by the first SRI field;an Xth SRS resource adjacent to the one or more SRS resources with a larger index than the one or more SRS resources indicated by the first SRI field; oran Xth SRS resource adjacent to a designated one of the one or more SRS resources indicated by the first SRI field, and wherein X is an integer.24.The wireless communication method of any of claims 20-23, wherein each of the one or more SRS resources is designated by a first number of bits in the first SRI field, wherein each of the one or more additional SRS resources is designated by a second number of bits in one of the one or more additional SRI fields, the first number being greater than the second number.25.The wireless communication method of any of claims 1-11, wherein the one or more messages comprise at least one of:a first message that configures a plurality of groups of SRS resources, each SRS resource in each group of SRS resources being associated with a group of frequency resources of the plurality of groups of frequency resources;a second message that activates one or more groups of SRS resources of the plurality of groups of SRS resources; ora third message that indicates at least one group of SRS resources of the plurality of groups of SRS resources.26.The wireless communication method of claim 25, wherein the at least one group of SRS resources indicated by the third message is activated by the second message.27.The wireless communication method of any of claims 18, 19, 25, or 26, wherein the first message is a radio resource control (RRC) message, the second message is a medium access control-control element (MAC CE) message, and the third message is a downlink control information (DCI) message.28.The wireless communication method of any of claims 1-27, the transmission is an uplink transmission.29.An apparatus for wireless communication, comprising one or more processors, wherein the one or more processors are configured to implement a method of any one of claims 1-28.