Timing advance for transmitting information in a wireless communication network

Abstract

A method for wireless communication includes receiving common timing advance (TA) information indicated by a base station (BS) and determining a common TA value for uplink (UL) transmissions in accordance with the common TA information and time instance information. A method for wireless communication includes transmitting, to a user equipment (UE), common timing advance (TA) information indicated by a BS and scheduling UL transmissions, the common TA information and associated time instance information being applicable to determining a common TA value for UL transmissions by the UE. Other methods and related apparatuses, computer program products, and non-transitory computer-readable media for wireless communication are also disclosed.

Description

Technical Field

[0001] This disclosure relates generally to wireless communication, and more particularly to timing advance for transmitting information in wireless communication. Background Technology

[0002] Wireless communication technology is a key component of the increasingly interconnected global communication network. Wireless communication relies on accurately allocated time and frequency resources to transmit and receive wireless signals. In some cases, transmission delay may become non-negligible in order to maintain proper timing of signal transmission and reception between wireless network nodes, and may need to be considered when transmitting scheduled wireless signals. For example, timing advance (TA) can be used to compensate for transmission delay. Specifically, the delay of a signal scheduled to arrive at the receiving network node within a specific time window can be determined as timing advance. The transmitting network node can send the scheduled signal a certain amount of time advance before the scheduled time window to ensure that the signal arrives at the receiving network node within that scheduled time window. Summary of the Invention

[0003] The present invention is a brief description of certain aspects of this disclosure. It is not intended to limit the scope of this disclosure.

[0004] One aspect of the embodiments of this disclosure provides a method for wireless communication, including: receiving common TA information indicated by a base station (BS); and determining a common TA value for uplink (UL) transmission based on the common TA information and time information.

[0005] Another embodiment of this disclosure provides another method for wireless communication. The method includes: sending common TA information indicated by a BS to a user equipment (UE); and scheduling UL transmissions, wherein the common TA information and associated timing information are used to determine the common TA value for the UE's UL transmissions.

[0006] Another embodiment of this disclosure provides another method for wireless communication. The method includes: determining a plurality of reference common common TA values, the plurality of reference common TA values ​​including a first reference common TA value and at least one second reference common TA value; and transmitting common TA information. The common TA information includes first information indicating the first reference common TA value and second information indicating at least one offset component relative to the first reference common TA value and at least one second reference common TA value.

[0007] Another embodiment of this disclosure provides another method for wireless communication. The method includes: receiving public TA information, the public TA information including: first information indicating a first reference public TA value; and second information indicating at least one offset component of at least one second reference public TA value relative to the first reference public TA value.

[0008] Another embodiment of this disclosure provides another method for wireless communication. The method includes: receiving valid time information corresponding to at least one of public TA information or public TA drift information; and determining, based on the valid time information, whether at least one of the public TA information or public TA drift information has expired using a timer.

[0009] Another embodiment of this disclosure discloses another wireless communication device including at least one processor and a memory. The at least one processor is configured to read computer code from the memory and implement any of the methods disclosed above and below.

[0010] Another embodiment of this disclosure discloses a computer program product including a non-transitory computer-readable program medium on which code is stored, the code, when executed by at least one processor, causing the at least one processor to implement any of the methods disclosed above and below.

[0011] Another embodiment of this disclosure discloses a non-transitory computer-readable medium storing at least one program. When executed by at least one processor, the program causes the at least one processor to implement any of the methods disclosed above or below.

[0012] The above and other aspects and their embodiments are described in more detail in the accompanying drawings, description and claims. Attached Figure Description

[0013] Various exemplary embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. The drawings are provided for illustrative purposes only and depict only exemplary embodiments of the present disclosure to aid the reader's understanding. Therefore, the drawings should not be considered as limitations on the breadth, scope, or applicability of the present disclosure. It should be noted that these drawings are not necessarily drawn to scale for clarity and ease of explanation.

[0014] Figure 1 An exemplary network architecture for a non-terrestrial network (NTN) communication system is shown.

[0015] Figure 2This is a flowchart illustrating an exemplary embodiment of the wireless communication method disclosed herein;

[0016] Figure 3 This is a flowchart of another exemplary embodiment of the wireless communication method disclosed herein;

[0017] Figure 4 A timing diagram of wireless signal transmission according to an exemplary embodiment of the present disclosure is shown;

[0018] Figure 5 A timing diagram of multiple common TA values ​​according to exemplary embodiments of the present disclosure is shown;

[0019] Figure 6 A wireless signal transmission method according to an exemplary embodiment of the present disclosure is shown;

[0020] Figure 7 This is a timing diagram of signal transmission according to another exemplary embodiment of the present disclosure;

[0021] Figure 8 A timing diagram of public TA information and public TA drift information according to an exemplary embodiment of the present disclosure is shown;

[0022] Figure 9 The distribution of common TA values ​​and common TA drift rates according to another exemplary embodiment of this disclosure is shown;

[0023] Figure 10 A timing diagram of wireless signal transmission according to an exemplary embodiment of the present disclosure is shown;

[0024] Figure 11 A system architecture of a user equipment according to an exemplary embodiment of the present disclosure is shown;

[0025] Figure 12 A flowchart illustrating a method for wireless communication according to exemplary embodiments of the present disclosure is shown; and

[0026] Figure 13 A wireless communication device according to an exemplary embodiment of the present disclosure is shown. Detailed Implementation

[0027] Various exemplary embodiments of this disclosure are described below with reference to the accompanying drawings to enable those skilled in the art to make and use this disclosure. This disclosure is not limited to the exemplary embodiments and applications described and illustrated herein. Furthermore, the specific order and / or hierarchy of steps in the methods disclosed herein are merely exemplary methods. Based on design preferences, the specific order or hierarchy of steps in the disclosed methods or processes may be rearranged while remaining within the scope of this disclosure. Therefore, those skilled in the art will understand that the methods and techniques disclosed herein present various steps or actions in an exemplary order, and unless otherwise expressly stated, this disclosure is not limited to the specific order or hierarchy presented.

[0028] The following disclosure relates to various timing advance techniques in a context where wireless signal transmission delay becomes non-negligible. To maintain the timeliness of scheduled wireless reception, a transmitting network node can be configured to determine a timing advance (TA) relative to a scheduled reception time window or moment at a receiving network node, and then use this timing advance to transmit the wireless signal before the scheduled time window or moment. Since the wireless signal transmission path length between the transmitting and receiving network nodes may dynamically change due to the movement of one or both of the transmitting or receiving network nodes and / or the movement of intermediate relay network nodes relative to the transmitting and receiving network nodes, it may be necessary to determine and account for such TA each time a scheduled wireless signal is transmitted by the transmitting network node. Before transmitting the scheduled wireless signal, the transmitting network node can determine the TA for that particular moment by adjusting one or more basic TAs or reference TAs from one or more previous moments. Such reference TAs can be indicated to the transmitting network node via, for example, a system signaling channel in various signaling formats. Similarly, the corresponding previous moment for the reference TA can be obtained in advance in various ways (e.g., via a system signaling channel). Adjusting the reference TA to obtain the current TA for transmitting the current radio signal by the transmitting network node can be further based on TA drift, which is the result of the passage of time since the moment associated with the reference TA. Such TA drift can be determined based on information indicated to the transmitting network node in various ways, such as via system signaling channels.

[0029] Although the exemplary embodiments below are implemented in the context of downlink (DL) and uplink (UL) wireless communication between a fixed base station (BS) and a user equipment (UE) via a mobile satellite acting as an intermediate network node, the basic principles of the embodiments below can be applied to other similar wireless communication scenarios in which a high-altitude platform station (HAPS), an aircraft, or other mobile object is used as an intermediate communication node.

[0030] Figure 1 An exemplary network architecture for a non-terrestrial network (NTN) communication system is illustrated. The system may include one or more sets of UEs, such as UE 1 or UE 2 as shown in the figure. The system may also include a base station (BS) and at least one satellite (SAT). In an NTN communication system, data or signal transmission between the UE and the BS can be achieved through an intermediate communication device, such as the satellite (SAT). Therefore, a service link (SL) is established between the satellite (SAT) and the UE, and another feeder link is established between the BS and the satellite (SAT).

[0031] For data or signal transmission, timing advance can be introduced to allow the transmitted signal to arrive at the BS within the appropriate time window. Timing advance takes into account the propagation delay of signal transmission, and the transmitter can send signals or data before a specific time length to compensate for this delay. In the NTN context, the location of the BS is typically unknown to the UE. To obtain a more accurate timing advance value, the BS can provide the UE with common timing advance (TA) information, allowing the UE to account for the propagation delay of UL transmission to ensure that the transmitted UL signals or data arrive at the BS within the appropriate time window (e.g., a scheduled time window or time).

[0032] Derivation of common TA value

[0033] However, in NTN and other similar contexts, the satellite SAT moves over time, such as... Figure 1 As shown. Therefore, the propagation delay of UL transmission may vary at different times or moments. It may be insufficient to estimate the required timing advance for UL transmission using only a fixed common timing advance value. Furthermore, due to the relatively large propagation delay and timing drift rate, the DL delay used for scheduling information transmission is not exactly the same as the UL delay used for transmitting scheduling information from the UE to the BS via satellite SAT in the form of radio signals or data. It may be insufficient to simply derive the timing advance for UL transmission based on either the DL feeder link delay or the UL feeder link delay.

[0034] To mitigate this problem, the reference common TA information provided by the BS can be compensated for by TA drift based on relevant time information. For example, the reference common TA value provided by the BS can be compensated based on the scheduling time and TA drift rate (the drift accumulated before the scheduling time for UL transmission), and further compensated based on the transmission time (relative to the scheduling time) and TA drift rate (the drift accumulated between the scheduling time and the transmission time) to obtain a more accurate common TA value for UL transmission. It should be noted that the embodiments in this disclosure can be applied to different types of NTN structures, and are not limited to, such as... Figure 1 The structure shown.

[0035] It is important to note that "common TA drift" refers to the offset between common TA values ​​at different times. "Common TA drift rate" refers to the rate of change of the common TA value over time. "Common TA drift information" refers to information provided by the BS to help the UE estimate the common TA drift, and for example, "common TA drift information" may include first-order common TA drift rate (or "common TA drift rate"), second-order common TA drift rate (or "common TA drift rate change"), or even higher-order drift rates.

[0036] In this document, the term "common" is used to indicate that the corresponding TA is common to all UEs communicating with the BS, because such TA is primarily determined by the feeder link delay between the BS and the satellite, and is independent of the UE. For a specific UE, the word "common" may be omitted without affecting the understanding of this disclosure.

[0037] Figure 2 This is a flowchart illustrating an exemplary embodiment of the wireless communication method disclosed herein. The wireless communication method includes:

[0038] Step 110: Receive the public TA information indicated by the BS; and

[0039] Step 120: Determine the common TA value for UL transmission based on the common TA information and time information.

[0040] Figure 3 This is another flowchart of another exemplary embodiment of the wireless communication method disclosed herein. The wireless communication method includes:

[0041] Step 210: Receive the public TA information indicated by the BS;

[0042] Step 220: Receive common TA drift information indicated by the BS; and

[0043] Step 230: Determine the common TA value for UL transmission based on common TA information, common TA drift information, and time information.

[0044] exist Figure 3 In this embodiment, when common TA information and common TA drift information are received in two different steps, the common TA information and common TA drift information can be indicated in the same System Information Block (SIB) and can be embedded together. Detailed implementation of the above steps is illustrated below with reference to exemplary figures.

[0045] Figure 4 A timing diagram of signal transmission according to an embodiment of the present disclosure is shown. Figure 4 The timing diagram shows Figure 1 The operation of the NTN network system. For example... Figure 4 As shown, BS at time t 0,t Broadcast / transmit common TA information carried, for example, by a System Information Block (SIB). The common TA information is associated with an activation time t0, which may coincide with, but is not necessarily the same as, the time when the SIB's common TA information passes through the satellite SAT. Furthermore, the BS may send scheduling signals at time t1 via the Physical Downlink Control Channel (PDCCH) to allow the UE to transmit UL data. For example... Figure 4 As shown, the scheduling signal passes through the satellite SAT at time t2 and is received by the UE at time t3. The scheduling signal is used to provide the UE with the scheduling time and other allocations on the Physical Uplink Shared Channel (PUSCH). Subsequently, the UE transmits UL data via the PUSCH at time t4 according to the scheduling, and the UL data passes through the satellite SAT at time t5, and is then received by the BS at time t6.

[0046] As described above, due to the relatively large propagation delay and timing drift associated with the feeder link between the BS and the satellite, the actual common TA for UL transmission at t4 is no longer equal to the reference value indicated by the BS at activation time t0 in order to properly compensate for the propagation delay. Furthermore, the DL feeder link delay for transmitting scheduling signals between times t2 and t1 may not be exactly the same as the UL feeder link delay for UL data traveling from the satellite SAT to the BS between times t5 and t6. To mitigate common TA misalignment, the TA drift during the time period between the activation time of the common TA information and the UL transmission can be determined, and a suitable common TA value can be derived for the transmission of UL data.

[0047] Specifically, since the satellite SAT is the receiver, the DL delay is determined by the satellite SAT position at time t2, while since the satellite is the transmitter, the UL delay is determined by the satellite SAT position at time t5. The difference between the DL feeder link delay and the UL feeder link delay is the accumulated one-way feeder link delay drift during the time period between t2 and t5. The common TA drift can be expressed as... The common TA value used in the PUSCH transmission of UL data can be derived from the following formula.

[0048]

[0049] in, It is the common TA value at the time the scheduling signal is sent, and TA is the common TA value used in the PUSCH transmission.

[0050] In addition, the common TA value at the time of sending the scheduling signal It can also be expressed by the following equation:

[0051]

[0052] in, The reference common TA value with activation time t0 is indicated by BS, and The TA drift is defined as the time difference between time t0 and time t2. Based on equations (1) and (2), the TA applied to the PUSCH transmission of UL data can be determined from the reference common TA value indicated by the BS with an activation time t0. To derive, the TA drift between time t0 and time t2... And the accumulated one-way delay drift during times t2 and t5 To adjust. That is,

[0053]

[0054] In addition, BS can provide TA drift information, including TA drift rate TA. drift The information is used to estimate the TA drift between time t0 and time t2, and the TA drift between time t2 and time t5. The cumulative round-trip TA drift between time t0 and time t2 can be derived by the following formula:

[0055]

[0056] Among them, TA drift It is the TA drift rate indicated by BS.

[0057] Similarly, the accumulated one-way delay drift during time t2 and time t5 It can be estimated using the following equation:

[0058]

[0059] Therefore, if the BS indicates a first-order TA drift rate in the public TA drift information, the TA value for round-trip UL transmission of UL data can be estimated using the following equation:

[0060]

[0061] Therefore, it can be based on the reference public TA value. TA drift rate TA driftThe common TA value for UL transmission of UL data is derived using relevant time information (such as activation time t0, scheduling time t2, and transmission time t5). In other words, the common TA value for UL transmission can be determined based on a reference common TA value and the time offset between the UL transmission time and the activation time associated with the reference common TA value.

[0062] In one implementation, the transmission time t5 can depend on a common TA value used for UL transmission, wherein, according to equation (6), this common TA value depends on t5. Therefore, to determine both t5 and TA, equation (6) can be used recursively. For example, t5 can first be set to t2 to obtain a first iterative TA. Then, such a TA can be used to determine the transmission time t5. Then, in a second iteration, a new TA can be determined using the new t5 according to equation (6). These recursive iterations of t5 can be performed a predetermined number of times, or until TA and t5 converge.

[0063] Alternatively, the UE can derive time t5 based on the PUSCH scheduling indicated by the BS, the reference common TA value at time t0, and the common TA drift rate. Specifically, the BS can indicate time t6 as the time when the UL data is expected to arrive at the BS. The (approximate) propagation time between t5 and t6 can be derived from the common TA value at time t0 (i.e., ) and the corresponding common TA drift rate (i.e., TA drift Alternatively, time t5 can be derived by solving the following equation:

[0064]

[0065] Furthermore, the TA discussed above only considers the feeder link delay between the BS and the satellite. To determine the actual UL transmission time, the service link propagation delay between the satellite and the UE can also be considered. Such delay can be estimated by the UE using, for example, known satellite and UE locations.

[0066] In addition, to more accurately estimate the common TA value used for UL transmission, the BS can include additional factors, such as the second-order common TA drift rate (or common TA drift rate variation), in the common TA information provided to the UE.

[0067] Therefore, the common TA drift between time t0 and time t2 The following equation can be used to derive the result.

[0068]

[0069] Among them, TA drift,dirft This is the second-order common TA drift rate.

[0070] In addition, the accumulated single-path feeder link delay drift during time t2 and time t5 The following equation can be used to derive the result.

[0071]

[0072] Therefore, when the first-order common TA drift rate and the second-order common TA drift rate are provided, the common TA value used for UL transmission can be derived by the following equation:

[0073]

[0074] In other words, the TA value for UL data transmission can be derived based on the reference common TA value, the first-order common TA drift rate, the second-order common TA drift rate, and relevant time information (such as activation time t0, scheduling time t2, and transmission time t5).

[0075] Figure 5 A timing diagram of multiple common TA values ​​according to another embodiment of this disclosure is shown. In one embodiment, the BS may provide the UE with common TA information, which includes multiple reference common TA values ​​corresponding to multiple different valid times. The multiple reference common TA values ​​are used as common TA values ​​for UL transmission during their corresponding valid times. Alternatively, the multiple reference common TA values ​​are used as parameters during their corresponding valid times to derive estimated common TA values ​​for UL transmission. Figure 5 As shown, TA0, TA1, and TA2 correspond to t0 and t... TA1 t TA2 and t TA3 The time frames between t0 and t1. TA1 and t TA2 This indicates the activation time of reference common TA values ​​TA0, TA1, and TA2. Multiple reference common TA values ​​can be bound together and indicated jointly in the same SIB, but this is not mandatory. The validity period of multiple reference common TA values ​​can also be indicated in the same SIB as the multiple reference common TA values, but this is not mandatory. Furthermore, reference common TA values ​​and validity periods can be indicated in various formats, which indicate timing advance and validity period.

[0076] Even if the BS indicates multiple reference common TA values ​​corresponding to multiple different valid times, UL transmission within a specific valid time frame is not limited to using only one reference common TA value from that specific valid time frame as its common TA value for UL transmission. For example, as Figure 5As shown, UL transmissions within the valid time of the reference common TA value TA1 can use the corresponding reference common TA value TA1 as their TA value for UL transmission. Alternatively, the UE can derive the common TA value for UL transmission by further considering the common TA values ​​of one or more adjacent valid time frames. Specifically, interpolation techniques can be introduced to more accurately estimate the common TA value for UL transmission. For example, for transmissions within the valid time frame of the reference common TA value TA1, the UE can use the reference common TA value TA1 as their TA value for UL transmission. Figure 5 In time t TA1 With time t TA2 For UL transmissions scheduled between time t, the TA value for the UL transmission at time t can be derived using the following equation.

[0077] in

[0078] TA t It is the TA value used for UL transmission at time t.

[0079] TA1 is the reference common TA value for the effective time of UL transmission.

[0080] TA2 is a subsequent reference common TA value for the effective time.

[0081] t is the time for scheduling UL transmission.

[0082] t TA1 It refers to the activation time of the public TA value TA1, and

[0083] t TA2 It refers to the activation time of the public TA value TA2.

[0084] Therefore, the common TA value for UL transmission at time t can be determined based on two consecutive reference common TA values ​​and the relative time interval between time t and the activation times of the two consecutive reference common TA values. The closer time t is to the activation time of a particular reference common TA value, the higher the weight of that particular reference common TA.

[0085] Figure 6 A transmission method according to an embodiment of the present disclosure is illustrated. In this embodiment, the overhead of providing public TA information can be reduced by reporting a first reference public TA value and reporting a series of offsets, the public TA information indicating a plurality of reference public TA values, each offset corresponding to one of the remaining second reference public TA values. The offsets indicate the difference between at least one second reference public TA value and the first reference public TA value. For example, as... Figure 6 As shown, BS can indicate TA0 as the basic reference common TA value, and BS indicates the offset ΔTA corresponding to the three subsequent reference common TA values ​​(i.e., at least one second reference common TA value). 0→1ΔTA 1→2 and ΔTA 2→3 .

[0086] Furthermore, in one implementation, the offset can indicate the difference between two consecutive reference common TA values. For example, for time t TA2 The offset indicated by the activated reference common TA value TA2 can include the difference between the reference common TA value TA2 and the previous reference common TA value TA1. Since the value of the reference common TA value TA1 is also indicated by the BS in offset format, the UE can derive the actual reference common TA value TA2 by adding the two offsets of the reference common TA values ​​TA1 and TA2 to the basic reference common TA value TA0, based on the offset of the previous reference common TA value TA1 and the offset of the current reference common TA value TA2. The BS uses the information of the full TA value to indicate the reference common TA value TA0.

[0087] In another implementation, the BS may indicate each offset of each subsequent reference common TA value, where each offset is the difference between each subsequent reference common TA value and the indicated full value. For example, the offsets of reference common TA values ​​TA1 and TA2 are their offsets relative to the basic reference common TA value TA0, respectively. In this case, the UE derives the original reference common TA value by adding the corresponding offset of each subsequent reference common TA value to the basic reference common TA value TA0.

[0088] The aforementioned information indication method can also be applied to indicate the common TA drift rate and validity period. For example, BS can indicate a first validity period, and a series of offsets corresponding to a series of validity periods following the first validity period. Each offset can indicate the difference between the corresponding validity period and the first validity period, or alternatively, each offset can indicate the difference between the corresponding validity period and the validity period immediately preceding that corresponding validity period.

[0089] Similarly, the BS can also indicate a first common TA drift rate, and a series of offsets corresponding to a series of common TA drift rates following the first common TA drift rate. Each offset can indicate the difference between the corresponding common TA drift rate and the first common TA drift rate, or alternatively, each offset can indicate the difference between the corresponding common TA drift rate and the common TA drift rate immediately preceding that corresponding common TA drift rate. The UE can use the base value and offsets to derive the original value of the effective time or common TA drift rate.

[0090] Figure 7 This is a timing diagram of signal transmission according to an exemplary embodiment of the present disclosure. Figure 7In a given timeframe, when multiple reference common TA values ​​have corresponding valid timeframes, a UL transmission within a specific timeframe can have a common TA value for UL transmission derived from the reference common TA values ​​of that specific timeframe and (one or more) adjacent timeframes. For example, such as Figure 7 As shown, for UL transmission at time t4, the common TA value used for UL transmission can be the average of the reference common TA values ​​TA0 and TA1. TA0 can be the average of time t0 and time t... TA1 The reference common TA value between them, and TA1 can be time t. TA1 With time t TA2 The reference common TA value between them. By considering the reference common TA value of the current UL transmission time frame and the reference common TA value of the scheduling signal time frame, the appropriate common TA value for UL transmission can be derived more accurately to mitigate the differences caused by the inequality between DL delay and UL delay.

[0091] Furthermore, in one embodiment, when the scheduling time is within a valid time period different from the transmission time, an interpolation method can be introduced to estimate a more accurate common TA value for UL transmission. In this embodiment, the common TA value for UL transmission at time t4 (e.g., Figure 7 (As shown) can be the adjusted reference common TA value TA for times t2 and t5. t2 and TA t5 The average value. Time t2 can be the time when the scheduling signal passes through the satellite SAT, and time t5 can be the estimated time when the UL data arrives at the satellite SAT. The common TA value used for UL transmission at time t4 can be derived by the following equation,

[0092] in

[0093] and

[0094] in

[0095] TA t4 It is the common TA value transmitted at t4 via UL.

[0096] TA t2 It is the adjusted common TA value of t2.

[0097] TA t5 It is the adjusted common TA value of t5.

[0098] TA1 is in t TA1 The reference public TA value is activated at that location.

[0099] TA2 is in t TA2The reference public TA value is activated at that location.

[0100] TA0 is the reference common TA value activated at t0.

[0101] t0 is the activation time of TA0.

[0102] t2 is the scheduling time.

[0103] t5 is the transmission time.

[0104] t TA1 It is the activation time of TA1, and

[0105] t TA2 This is the activation time of TA2.

[0106] In the above equation, interpolation techniques are used to estimate the common TA value TA for times t2 and t5. t2 and TA t5 And then through TA t2 and TA t5 The common TA value used for UL transmissions is estimated by averaging the values ​​of the most recent UL transmissions. In summary, the common TA value of a UL transmission can be determined based on the common TA value of the most recent UL transmission and the time offset between UL transmissions.

[0107] Figure 8 A timing diagram of public TA information and public TA drift information according to an embodiment of this disclosure is shown. Figure 5 Similarly, the public TA information includes multiple reference public TA values ​​corresponding to multiple different valid times. Here, the public TA information provided by the BS includes multiple reference public TA values ​​and multiple public TA drift rates corresponding to multiple different valid times. For example, as... Figure 8 As shown, time t0, t TA1 t TA2 and t TA3 Indicates the activation time of the reference public TA values ​​TA0, TA1, TA2, and TA3. For example... Figure 8 As shown, time t0, t TA1 t TA2 and t TA3 It also indicates the public TA drift rate TA. drift,0 TA drift,1 TA drift,2 and TA drift,3 The activation time. Therefore, the UE can deduce the common TA value of UL transmission at different effective times based on the common TA information and common TA drift information. For example, if UL transmission is scheduled during the effective time of TA1, it can be determined by using, for example, the above equation (3) or (9), based on the reference common TA value TA1 and the common TA drift rate TA.drift,1 To derive the common TA value used for UL transmission.

[0108] Figure 9 The distribution of common TA values ​​and common TA drift rates according to another exemplary embodiment of this disclosure is shown. Figure 9 As shown, the validity period of multiple common TA drift rates can share the same reference common TA value. That is, the BS can skip the indication of the reference common TA value for a specific validity period of the common TA drift rate. For example, as... Figure 9 As shown, BS only indicates the use of t TA1 With t TA2 The time between and t TA2 With t TA3 The common TA drift rate between the two times, but t TA1 With t TA2 The time between and t TA2 With t TA3 There is no updated reference common TA between these times. In this setting, valid times without a specifically assigned reference common TA value will use the reference common TA value assigned to adjacent valid times. For example, when a reference common TA value... Then, following N first-order common TA drift rates, if t2 (e.g.) Figure 4 The scheduling time shown is in TA drift,i During the effective time, t5 (e.g. Figure 4 The transmission time shown is in TA drift,j Within the effective timeframe, and given that j>i≥1, the common TA value can be derived using the following equation:

[0109]

[0110]

[0111]

[0112] If i = 0, then only one common TA drift rate is used for t0 to t2, i.e.

[0113]

[0114] If j=1, then only one common TA drift rate is used for times t2 to t5, i.e.,

[0115] Then the common TA value for UL transmission can be derived according to equation (3).

[0116] In equation (14) above, the common TA drift between t0 and t2 is first derived, and in equation (15) above, the common TA drift between t5 and t2 is further derived. Then, the common TA value used for UL transmission is the common TA value. Adding the common TA drift between t0 and t2. When the second-order drift rate is also as... Figure 7 When used in the setup shown, the common TA value for UL transmission can be derived by applying the principle of equation (9).

[0117] Time indication

[0118] Some of the above embodiments disclose deriving the common TA value for UL transmission based on a reference common TA value, the common TA drift rate, and relevant time information (such as activation time t0, scheduling time t2, and transmission time t5). The UE can obtain the time information in different ways as described below.

[0119] For example, the UE can obtain timing information through implicit indication. In this case, timing information is implicitly indicated based on the time slot of the System Information Block (SIB), the start boundary of a subframe, or the end boundary of a frame. The UE can deduce the time indicated by the BS after DL synchronization.

[0120] For example, public TA information can be broadcast to one or more UEs via an SIB. The activation time t0 of the public TA information / value can be set to the last time slot (or time interval) carried in the SIB, the end boundary of a subframe, or a frame. In this case, the UE can determine when the indicated reference public TA value is activated and perform the above derivation to obtain the public TA value for UL transmission.

[0121] The same boundary of a time slot, subframe, or frame can correspond to different absolute times at the BS, satellite SAT, and different UEs due to propagation delay. To avoid misalignment, the BS and UE can reach a consensus on where the time reference point is. Since the location of the BS is usually unknown to the UE, the time at the BS is difficult to derive for the UE. Furthermore, different UEs may have different locations; therefore, determining the reference point for the time at a specific UE may be impractical. Therefore, the satellite SAT can be used as the time reference point; that is, the absolute time when the boundary of a time slot, subframe, or frame passes through the satellite SAT is considered the actual time.

[0122] Furthermore, the absolute time when a time slot, subframe, or frame boundary crosses the satellite SAT can be derived from both the BS and the UE. For example, as Figure 4As shown, the activation time t0 can be set as the end boundary of the SIB containing public TA information at the satellite SAT. The BS and UE can communicate via the transmission time t0. 0,t Add feeder link delay and at reception time t 0,r The activation time t0 is derived by subtracting the service link delay. Similarly, the UE can derive t2 and t5 based on the propagation time delay. The UE can use these times to derive the drift value. and Using the activation time t0, BS can accurately indicate the reference common TA value for a specific activation time.

[0123] Alternatively, the time can be explicitly indicated. In this case, the BS can explicitly send a timestamp to the UE to indicate the time information. The timestamp can be included in the public TA information or other information packets, and can also be sent separately. The timestamp can be included in the same SIB as the public TA information, but is not required. For example, the BS can directly indicate the absolute time t0 to the UE to allow the UE to deduce when the public TA information or reference public TA value is activated. Then, as shown in this disclosure, the UE can use the activation time indicated here, along with other information, to deduce the public TA value for UL transmission. In this case, the activation time t0 is not necessarily associated with or the same as the time when the SIB containing the public TA information is sent in the implicit indication method (such as the time indicated by example, when the boundary of a time slot, subframe, or frame passes through the satellite SAT). The public TA can be at any time (e.g., substantially after the indication of the public TA information, such as...). Figure 10 (As shown) is activated. In Figure 10 In this context, the activation time t0 is indicated as the time after the SIB carrying the public TA information arrives at the UE.

[0124] Furthermore, to achieve explicit indication of time information, the BS and UE can be synchronized to the same reference time (e.g., Global Navigation Satellite System (GNSS) time). Different absolute time references can cause errors in TA derivation. Therefore, the UE's oscillation error should be sufficiently small, which leads to higher synchronization requirements.

[0125] Effective time monitoring

[0126] According to exemplary embodiments of this disclosure, the reference common TA value and / or TA drift rate of each indication can be associated with a valid time period. During the valid time period, the corresponding reference common TA value and common TA drift rate are considered sufficiently accurate. Therefore, the UE can have, for example... Figure 11The timer shown is an example. The timer can be electrically coupled to one or more processors, and the one or more processors can also be coupled to one or more sets of memory, which store at least one program to be executed by the one or more processors. The UE can execute, for example... Figure 12 The steps shown include:

[0127] Step 510: Receive valid time information corresponding to at least one of the public TA information or public TA drift information; and

[0128] Step 520: Determine whether at least one of the public TA information or public TA drift information has expired by using a timer based on the valid time information.

[0129] If, based on the valid time information, the timer indicates that the public TA information / value or public TA drift information has expired, the UE will continue...

[0130] Step 530: The user equipment performs a Random Access Channel (RACH) procedure to reconnect to the network.

[0131] Furthermore, the UE's timer can be reset under at least one of the following conditions: subsequent common TA information is activated, subsequent common TA drift information is activated, a Medium Access Control Element (MAC CE) TA command is received, or a command to reset the timer is received. Specifically, the BS can estimate TA misalignment based on UL transmission results. The BS can request TA adjustment via the MAC CE TA command. Once the UE receives the MAC CE TA command along with the adjusted TA, the timer can be reset.

[0132] Wireless communication devices

[0133] Figure 13 A wireless communication apparatus according to an embodiment of the present disclosure is illustrated. This architecture can be used as a UE or BS. The wireless communication apparatus includes one or more processors and one or more sets of memory. The memory stores one or more non-transitory computer-readable medium programs. The one or more processors can execute the non-transitory computer-readable medium programs to perform the methods described above for wireless communication. Exemplarily, the wireless communication apparatus may include a transmitter and a receiver for transmitting or receiving signals. The wireless communication apparatus may also include a user input / output (I / O) interface that accepts user commands.

[0134] Furthermore, at least one program stored in the memory can be transferred by a computer program product. The computer program product includes a non-transitory computer-readable program medium on which code is stored. When executed by at least one processor, the code causes the at least one processor to implement the aforementioned method for wireless communication.

[0135] Table 1 below lists the abbreviations used in this disclosure.

[0136]

[0137]

[0138] This disclosure is intended to cover any conceivable variations, uses, combinations, or adaptations of this disclosure that follow the general principles thereof, and includes common knowledge and conventional techniques not disclosed in the art or in this application.

[0139] It should be understood that this disclosure is not limited to the precise structures or operations shown above and in the accompanying drawings, and various modifications and changes can be made without departing from the scope of this application. The scope of this application is limited only to the appended claims.

Claims

1. A method for wireless communication, comprising: Receive common timing advance TA information indicated by a base station (BS) at one or more UEs; wherein the common TA information is based on the feeder link delay between the BS and intermediate network nodes and is common to the one or more UEs; Receive common TA drift information indicated by the BS at one or more UEs; and The common TA value of the uplink UL transmission is determined based on the common TA information, the common TA drift information, and the time information; wherein the time information includes at least one of the following: the transmission time of the UL transmission; the activation time associated with at least one parameter included in the common TA information; or the scheduling time of the UL transmission; the activation time is the activation time of the common TA information or the common TA value, and the scheduling time includes the scheduling time of the UL transmission.

2. The method according to claim 1, wherein, Determining the common TA value of the UL transmission based on the common TA information and the time information includes: The common TA value of the UL transmission is determined based on a reference common TA value and the time offset between the transmission time and the activation time of the UL transmission associated with the reference common TA value.

3. The method according to claim 1, wherein, Determining the common TA value of the UL transmission based on the common TA information and the time information includes: The common TA value of the UL transmission is determined based on the common TA value of the most recent UL transmission and the time offset between the UL transmission and the most recent UL transmission.

4. The method according to claim 1, wherein, Determining the common TA value of the UL transmission based on the common TA information, the common TA drift information, and the time information includes: Determine the common TA drift accumulated before the UL transmission is scheduled by the BS.

5. The method according to claim 1, wherein, Determining the common TA value of the UL transmission based on the common TA information, the common TA drift information, and the time information includes: Determine the common TA drift between the scheduling time of the UL transmission and the transmission time of the UL transmission.

6. The method according to claim 1, wherein, Determining the common TA value of the UL transmission based on the common TA information, the common TA drift information, and the time information includes: The common TA value of the UL transmission is determined based on the reference common TA value included in the common TA information, the common TA drift accumulated before scheduling the UL transmission, and the common TA drift between the scheduling time of the UL transmission and the transmission time of the UL transmission.

7. The method according to claim 6, further comprising: The common TA drift between the scheduling time and the transmission time of the UL transmission is determined based on the common TA drift rate included in the common TA drift information, the scheduling time of the UL transmission, and the transmission time of the UL transmission.

8. The method according to claim 6, further comprising: The common TA drift between the scheduling time of the UL transmission and the transmission time of the UL transmission is determined based on the common TA drift rate and the change of the common TA drift rate included in the common TA drift information, as well as the scheduling time of the UL transmission and the transmission time of the UL transmission.

9. The method according to claim 4, wherein, Determining the common TA drift accumulated prior to the UL transmission being scheduled by the BS includes: Based on the common TA drift rate included in the common TA drift information and the scheduling time of the UL transmission in the timing information, the accumulated common TA drift before scheduling the UL transmission is determined.

10. The method according to claim 4, wherein, Determining the common TA drift accumulated before the UL transmission is scheduled by the BS includes: Based on the common TA drift rate and common TA drift rate change included in the common TA drift information, and the scheduling time of the UL transmission in the timing information, the accumulated common TA drift before scheduling the UL transmission is determined.

11. The method according to claim 1, wherein, The public TA drift information includes: First common TA drift rate; and At least one offset component corresponding to at least one second common TA drift rate relative to the first common TA drift rate.

12. The method according to claim 11, wherein, Determining the common TA value of the UL transmission includes: The at least one second common TA drift rate is derived based on the at least one offset component corresponding to the at least one second common TA drift rate and the first common TA drift rate.

13. The method according to claim 1, wherein, Determining the common TA value of the UL transmission includes: The common TA value of the UL transmission is determined based on the following: ,in, It is the common TA value transmitted by the UL. It is the reference public TA value included in the public TA information. It is the common TA drift rate included in the common TA drift information. It is the reference common TA value Activation time, It is the scheduling time of the BS for the UL transmission, and It is the transmission time of the UL transmission.

14. The method according to claim 1, wherein, Determining the common TA value of the UL transmission includes: The common TA value of the UL transmission is determined based on the following: ,in, It is the common TA value transmitted by the UL. It is the reference public TA value included in the public TA information. It is the first-order common TA drift rate included in the common TA drift information. It is the second-order common TA drift rate included in the common TA drift information. It is the reference common TA value Activation time, It is the scheduling time of the UL transmission, and It is the transmission time of the UL transmission.

15. The method according to claim 1, wherein, The time information includes at least one time associated with the intermediate communication device.

16. The method of claim 15, further comprising: The at least one time point is determined at the intermediate communication device based on the time elapsed at the boundary of at least one of the last time slot, subframe, or frame of the System Information Block (SIB) of the BS.

17. The method according to claim 1, wherein, The public TA information includes multiple reference public TA values ​​in a System Information Block (SIB).

18. The method according to claim 17, wherein, The common TA drift information includes multiple common TA drift rates corresponding to the multiple reference common TA values ​​in the SIB.

19. The method according to claim 1, wherein, The public TA information includes a reference public TA value in a System Information Block (SIB), and the public TA drift information includes multiple public TA drift rates corresponding to the reference public TA value in the SIB.

20. The method according to claim 1, wherein, The public TA information includes multiple reference public TA values ​​in a System Information Block (SIB).

21. The method according to claim 20, wherein, The public TA information also includes at least one corresponding valid time in the SIB that corresponds to the plurality of reference public TA values.

22. The method according to claim 20, wherein, Determining the common TA value of the UL transmission based on the common TA information and the time information includes: When the scheduling time of the UL transmission is before the expiration of the first reference common TA value among the plurality of reference common TA values, and the transmission time of the UL transmission is after the activation of the second reference common TA value among the plurality of reference common TA values, the common TA value of the UL transmission is determined according to the first reference common TA value and the second reference common TA value among the plurality of reference common TA values.

23. The method of claim 20, wherein, Determining the common TA value of the UL transmission based on the common TA information and the time information includes: The adjusted first common TA value is determined based on a first interpolated value derived from the scheduling time and the first and second reference common TA values ​​among the plurality of reference common TA values. The adjusted second common TA value is determined based on a second interpolated value derived from the transmission time, the second reference common TA value, and a third reference common TA value among the plurality of reference common TA values; and The common TA value for UL transmission is determined based on the adjusted first common TA value and the adjusted second common TA value.

24. The method of claim 20, wherein, Determining the common TA value of the UL transmission based on the common TA information and the time information includes: The common TA value of the UL transmission is determined based on the interpolated value derived from the first and second reference common TA values ​​that are scheduled to be activated sequentially from the plurality of reference common TA values.

25. The method according to claim 24, wherein, Determining the common TA value of the UL transmission based on the interpolation value includes: The common TA value of the UL transmission is determined based on the following: ,in, It is the public TA value to be determined in the UL transmission. t is the transmission time of the UL transmission. and It is scheduled to be in time and The first reference common TA value and the second reference common TA value are activated sequentially.

26. The method according to claim 1, wherein, The public TA information includes: First reference common TA value; and At least one offset component corresponding to at least one second reference common TA value relative to the first reference common TA value.

27. The method according to claim 26, wherein, Determining the common TA value of the UL transmission includes: deriving the at least one second reference common TA value based on the at least one offset component corresponding to the at least one second reference common TA value and the first reference common TA value.

28. The method according to claim 1, wherein, The public TA information includes: The first valid time corresponding to the first reference common TA value; and The second valid time corresponds to at least one offset component of the second valid time relative to the first valid time, and the second valid time corresponds to at least one second reference common TA value, or to at least one offset component of the at least one second reference common TA value relative to the first reference common TA value.

29. The method according to claim 28, wherein, Determining the common TA value of the UL transmission includes: The at least one second effective time is derived based on at least one offset component of the at least one second effective time and the first effective time.

30. The method according to claim 1, further comprising: Receive at least one timestamp indicating the time information; The determination of the common TA value for UL transmission based on the common TA information and the time information includes: The public TA value of the UL transmission is determined based on the public TA information and the at least one timestamp.

31. The method of claim 30, wherein, The at least one timestamp indicates at least one of the following: The activation time of at least one parameter of the public TA information, or The activation time of at least one parameter of the public TA drift information.

32. The method according to claim 31, wherein, The activation time of at least one parameter of the public TA information and the activation time of at least one parameter of the public TA drift information are indicated using the time of the Global Navigation Satellite System as a reference.

33. The method according to claim 31, wherein, The activation time of at least one parameter of the public TA information is substantially different from the transmission time of the public TA information.

34. A method for wireless communication, comprising: Send common timing advance TA information indicated by the base station (BS) to one or more user equipment (UEs); wherein the common TA information is based on the feeder link delay between the BS and intermediate network nodes and is common to the one or more UEs; Send common TA drift information indicated by the BS to the one or more UEs; and The uplink UL transmission is scheduled, and the common TA information, the common TA drift information, and the time information are used to determine the common TA value of the UL transmission for one or more UEs; wherein the time information includes at least one of the following: the transmission time of the UL transmission; an activation time associated with at least one parameter included in the common TA information; or the scheduling time of the UL transmission; the activation time is the activation time of the common TA information or the common TA value, and the scheduling time includes the scheduling time of the UL transmission.

35. The method according to claim 34, wherein, The public TA information includes multiple reference public TA values ​​in a System Information Block (SIB).

36. The method according to claim 35, wherein, The common TA drift information includes multiple common TA drift rates corresponding to the multiple reference common TA values ​​in the SIB.

37. The method of claim 34, wherein, The common TA information includes a reference common TA value in a System Information Block (SIB), and the common TA drift information includes multiple common TA drift rates corresponding to the reference common TA value in the SIB.

38. The method of claim 34, wherein, The public TA drift information includes: First common TA drift rate; and At least one offset component corresponding to at least one second common TA drift rate relative to the first common TA drift rate.

39. The method according to claim 34, wherein, The public TA information includes multiple reference public TA values ​​in a System Information Block (SIB).

40. The method according to claim 39, wherein, The public TA information also includes at least one corresponding valid time in the SIB that corresponds to the plurality of reference public TA values.

41. The method of claim 34, wherein, The public TA information includes: First reference common TA value; and At least one offset component corresponding to a second reference common TA value relative to the first reference common TA value.

42. The method of claim 34, wherein, The public TA information includes: The first effective time corresponding to the first reference common TA value; and At least one offset component of at least one second valid time relative to the first valid time, the at least one second valid time corresponds to at least one second common TA value, or at least one offset component corresponding to the at least one second reference common TA value.

43. The method of claim 34, further comprising: Send at least one timestamp indicating the time information.

44. The method of claim 43, wherein, The at least one timestamp indicates at least one of the following: The activation time of at least one parameter of the public TA information, or The activation time of at least one parameter of the public TA drift information.

45. The method according to claim 44, wherein, The activation time of at least one parameter of the public TA information and the activation time of at least one parameter of the public TA drift information are indicated using the time of the Global Navigation Satellite System as a reference.

46. ​​The method of claim 44, wherein, The activation time of at least one parameter of the public TA information is substantially different from the transmission time of the public TA information.

47. A wireless communication device, comprising at least one processor and a memory, wherein, The at least one processor is configured to read code from the memory and implement the method according to any one of claims 1 to 46.

48. A non-transitory computer-readable medium storing at least one program, which, when executed by a processor, causes the processor to implement the method according to any one of claims 1 to 46.

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