KR20100038130A - Method for ul transmitting a control information in a mobile communication system - Google Patents

Abstract

PURPOSE: In a mobile communications system, by multiplexing two or more control channels a method for transmitting upwardly control information efficiently transmits the control information. CONSTITUTION: A control channel becomes in the time domain. The control channel comprises the guard interval for preventing the interference of the adjacent channel. It is overlapped with at least a part of the control channel is the non-transmission time interval in the communications execution process. The control information is transmitted through the control channel which becomes as described above. The guard interval comprises the CP(Cyclic Prefix) and GT(Guard Time), at least, one. The control channel comprises the preamble part for ranging.

Description

METHOD FOR UL TRANSMITTING A CONTROL INFORMATION IN A MOBILE COMMUNICATION SYSTEM}

The present invention relates to a mobile communication system. In particular, the present invention relates to a mobile communication system supporting a Time Division Duplex (TDD) scheme, a Full-Frequency Division Duplex (F-FDD) scheme, or a Half-Frequency Division Duplex (H-FDD) scheme. More specifically, the present invention relates to a method of uplink transmission of control information in a mobile communication system.

The major standards established by the IEEE 802.16 Working Group are IEEE 802.16-2004, called Fixed WiMAX, and IEEE 802.16e-2005 (16e), called Mobile WiMAX. IEEE 802.16e-2005 was finally approved by the IEEE in December 2005. The standards underlying the current version of Mobile WiMAX technology are IEEE 802.16-2004, IEEE 802.16e-2005 (this document includes Corrigenda of IEEE 802.16-2004), and IEEE 802.16-2004 / Corrigenda2 / D4. Currently, standardization of IEEE 802.16m (hereinafter 16m) for the next version of Mobile WiMAX is underway at TGm within the IEEE 802.16 workgroup.

In a mobile communication system, a radio frame is transmitted upward and downward to communicate between a base station and a terminal. The structure of a radio frame is variously designed according to a communication system, duplex mode, and the like. For example, in the time division duplex (TDD) mode, a radio frame includes a time period in which a signal is not transmitted to ensure the up => down or down => upward switching of the transceiver. In the Frequency Division Duplex (FDD) mode, it is not necessary to guarantee the up and down switching of the transceiver, but the radio frame may be designed to include a time period in which a signal is not transmitted for some reason. The non-transmission time interval added to the radio frame contributes to increase the communication efficiency, but since no signal is transmitted in the non-transmission time interval, radio resources are wasted.

The present invention has been made to solve the problems of the prior art as described above, and an object of the present invention is to provide a method for efficiently transmitting control information.

Another object of the present invention is to provide a method for efficiently transmitting control information using a non-transmission time interval.

It is another object of the present invention to provide a method of multiplexing at least two or more control channels.

The technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned above will be clearly understood by those skilled in the art from the following description. Could be.

In an aspect of the present invention, in a method for transmitting control information uplink in a mobile communication system, a control channel including a guard interval for preventing interference with an adjacent channel in a time domain is generated, wherein the control channel performs communication. Generating a signal to overlap at least a portion of a non-transmission time period during which a signal is not transmitted or received; And transmitting control information through the generated control channel.

Preferably, the guard period may include at least one of a cyclic prefix (CP) and a guard time (GT). The control channel may further include a preamble portion for ranging.

Preferably, the control channel may overlap at least a portion of the non-transmission time interval by extending the time length of the basic control channel. Here, the time length of the basic control channel may be defined in a subframe unit including a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols. For example, the basic control channel may be defined in units of one subframe or two subframes.

Preferably, the control channel may overlap at least a portion of the non-transmission time interval by adjusting the transmission time of the basic control channel.

Preferably, the mobile communication system performs communication using a super-frame, wherein one superframe consists of a plurality of frames, each frame consists of a plurality of subframes, and each subframe comprises a plurality of subframes. An Orthogonal Frequency Division Multiple Access (OFDMA) symbol is included, and the non-transmission time interval may be added to the inside or the end of the frame.

Preferably, the non-transmission time interval may include an idle time, an idle symbol, a RTG (Receive / transmit Transitioin Gap) or a TTG (Transmit / receive Transitioin Gap).

Preferably, the transmitting of the control information through the generated control channel may be performed after a predetermined time elapses from the start of the non-transmission period. Here, the predetermined time may be selected from Subscriber Station Receive / Transmit Gap (SSRTG), Round Trip Delay (RTD) / 2, and RTD / 2 + SSRTG.

Preferably, the control channel may be located in the last subframe among a plurality of subframes included in the uplink transmission region.

Preferably, the control channel can be multiplexed in the same subframe as a separate control channel. Here, the separate control channel may be multiplexed within a guard interval within the control channel. In addition, the control channel and the separate control channel may be multiplexed so as not to overlap in the time domain.

Preferably, the control channel may comprise a ranging channel. Here, the ranging channel includes an initial ranging channel, a handover ranging channel, a periodic ranging channel, or a bandwidth request channel. do.

Preferably, the mobile communication system may support a Time Division Duplex (TDD) scheme, a Full-Frequency Division Duplex (F-FDD) scheme, or a Half-Frequency Division Duplex (H-FDD) scheme.

According to the embodiments of the present invention, the following effects are obtained.

First, control information can be transmitted efficiently.

Second, control information may be transmitted using a non-transmission time interval.

Third, at least two or more control channels may be multiplexed.

The present invention has been made to solve the problems of the prior art as described above, and an object of the present invention is to provide a method for efficiently transmitting control information.

The effects obtainable in the present invention are not limited to the above-mentioned effects, and other effects not mentioned above may be clearly understood by those skilled in the art from the following description. will be.

The construction, operation, and other features of the present invention will be readily understood by the embodiments of the present invention described with reference to the accompanying drawings. The embodiments described below are examples to which the technical features of the present invention are applied.

In the present specification, the following symbols / terms are as follows unless otherwise stated.

BS (Base Station) Receive / transmit Transition Gap (RTG): The first sample of downlink (DL) burst followed by the last sample of uplink (UL) burst at the antenna port of BS using TDD transceiver Indicate the gap between. The RTG provides time for the BS to switch from receive mode (Rx) to transmit mode (Tx). During RTG, the BS does not transmit data and causes the BS transmitter carrier to ramp up and the Tx / Rx antenna switch to operate. It does not apply to FDD systems.

BS (Base Station) Transmit / receive Transition Gap (TGT): The gap between the last sample of downlink (DL) burst and the first sample of uplink (UL) burst at the antenna port of BS using TDD transceiver. Indicates. TTG provides the time for the BS to switch to transmit mode (Tx) to receive mode (Rx). During TTG, the BS does not transmit data and causes the BS transmitter carrier to ramp down and the Tx / Rx antenna switch to operate. It does not apply to FDD systems.

SSRTG (Subscriber Station Receive / Transmit Gap): Indicates minimum receive => transmit turnaround gap. SSRTG is measured in time from the last sample of the receive burst to the first sample of the transmit burst at the SS's antenna port.

SSTTG (Subscriber Station Transmit / Receive Gap): Indicates minimum transmit => receive turnaround gap. SSTTG is measured as the time from the last sample of the transmit burst to the first sample of the receive burst at the SS's antenna port.

T _CP or T _g : denotes an OFDM (A) data cyclic prefix duration. The time length of T _CP or T _g may be T _b / 8 or T _b / 16.

T _u or T _b : denotes an OFDM (A) useful symbol duration. It can be calculated as T _b = 1 / Δf _d = N _FFT / F _s . Here △ f _d represents the spacing of data sub-carriers, N _FFT denotes the smallest number, which is represented by the powers of two in the water is greater than N _used, Fs represents a data sampling frequency, N _used are used, including the DC sub-carrier Number of data subcarriers.

T _s (= T _CP + T _u ) or T _s (= T _b + T _g ): represents an OFDM (A) symbol duration including CP.

N _sym : represents the number of OFDM (A) symbols in a subframe.

T _RCP : The length of RCP (Ranging Cyclic Prefix).

T _RP : indicates the length of the ranging preamble.

Δf _RP indicates ranging subcarrier spacing. The structure of RCP and RP depends on Δf _RP . Δf _RP means subcarrier spacing within a predetermined bandwidth used to configure the ranging channel. In addition, Δf _RP may refer to subcarrier spacing within a localized bandwidth corresponding to a continuous P _sc of a predetermined size. P _sc is the frequency domain size of a contiguous resource unit, which is the same as the frequency resource size of the physical resource unit and corresponds to 18 subcarriers.

T _stu : This is the basic sampling time unit.

RTD: Round Trip Delay.

DS: Represents a channel delay spread.

/

: 각각 올림 및 내림 함수를 나타낸다.-

Of

: Represents the raising and lowering functions, respectively.

In the following, DS is assumed to be equal to the time length of the data CP, unless otherwise stated for the purpose of explanation. In addition, it is assumed that the terminal knows T _RP , TTG, SSTRG through signaling from the base station. Although not limited thereto, the signaling may be performed through a DCD message of a legacy system (IEEE 802.16e). In addition, it is assumed that the basic sampling time unit is T _stu = 1 / (10937.5 × 2048) seconds. T _stu = 1 / (10937.5 × 2048) can be interpreted as the sampling time for a nominal channel bandwidth (22.4 MHz sampling frequency) of 20 MHz without considering oversampling. It is possible to use the same length of time calculated in the 20 MHz bandwidth for the other bandwidths. For example, the time length calculated at 20 MHz may equally be used for system bandwidths of 5 MHz and 10 MHz. 91.43μs, which is the effective symbol period of IEEE 802.16m, can be expressed as '2048 × T _stu' using the basic sampling time unit, and a data CP having a time length of 1/8 times the effective symbol period is '256 × T _stu'. For example, a data CP having a time length of 1/16 may be represented as '128 × T _stu '.

In IEEE 802.16e, the length of the TTG and the RTG is defined to be at least 5 μs, and the base station informs the terminals through the DCD channel encoding.

In IEEE 802.16e, the lengths of the SSTTG and the SSRTG are informed by the base station to the terminals through SBC-REQ / RSP management message encodings.

In the WiMAX Forum Mobile System Profile Release (Revision 1.4.0), the time lengths of TTG, RTG, SSTTG, and SSTRG have fixed values. SSTRG and SSTTG have a time length of 50 μs as the minimum performance of the UE, and TTG and RTG may have various values as shown in Table 3 according to the system bandwidth.

Here, BW represents a system bandwidth, and n has a sampling factor of 8/7 or 28/25 depending on the BW. Fs is defined as F _s = floor (n BW / 8000) 8000 as the sampling frequency. PS is defined as PS = 4 / F _s as a physical slot. TTG and RTG values are expressed in PS and us.

1 shows a type-1 frame structure of a TDD mode having T _CP = 1/8 · T _u in IEEE 802.16m. The superframe is 20ms and has 4 frames. Referring to FIG. 1, each frame is 5ms and consists of eight subframes. There are two kinds of subframes. Type-1 subframes (or regular subframes) consist of 6 Orthogonal Frequency Division Multiplexing (OFDM) symbols of 0.617ms. The type-1 short subframe (or irregular subframe) occupies the same time as the type-1 subframe, but the last OFDM symbol is not used for transmission as an idle symbol. During the change from DL to UL, there is a 102.857us downtime and the switching point from UL to DL has a 62.86us downtime.

2 shows a type-1 frame structure of an FDD mode having T _CP = 1/8 · T _u in IEEE 802.16m. Referring to FIG. 2, the superframe is 20 ms and has four frames. Each frame is 5ms and consists of 8 subframes with a 62.86us idle time. The subframe consists of 6 OFDM symbols of 0.617 ms.

3 shows a frame structure of TDD and FDD modes having T _CP = 1/16 · T _u in IEEE 802.16m. Referring to FIG. 3, each frame is 5ms and consists of eight subframes. There are two kinds of subframes. The type-1 subframe consists of 6 OFDM symbols of 0.583 ms. The type-2 subframe consists of 7 OFDM symbols of 0.680 ms. In the TDD mode, the TTG is present during the change from DL to UL and the RTG is present during the change from UL to DL. In the FDD mode, there is a pause time at the end of every frame.

The present invention provides a technique of using a time domain (hereinafter, referred to as a non-transmission time interval) that is not generally used for actual transmission, such as an idle time, an idle symbol, TTG, and RTG, present in a frame structure, for a specific channel. The specific channel includes a control channel. For convenience, the present invention will be described using a ranging channel.

Regarding the configuration of the ranging channel, the ranging channel period, the ranging subcarrier spacing, the ranging bandwidth, the ranging code type / length, the zero-correlation zone (described herein) ( whether to use cyclic shift for increasing opportunity (number of available codes), purpose of ranging channel (initial ranging, periodic ranging, handover ranging, bandwidth request ranging, etc.), how to use frequency of ranging channel (localized allocation, distributed allocation, sub-band, grouping, etc.) is an example and is not a limitation of the present invention.

In all the drawings attached hereto, the horizontal axis represents the time domain and the vertical axis represents the frequency domain. The frequency domain may be expressed as a physical subcarrier or a logical subcarrier. In addition, a specific frequency region within the ranging region may be allocated to a guard band (or guard frequency) for preventing intercarrier interference with an adjacent channel and thus may not be used for actual transmission. For example, portions of both ends of the frequency domain of the ranging channel may be allocated to the guard band and may not be used for actual transmission.

4 illustrates a structure of a basic ranging channel that can be used in an embodiment of the present invention. Referring to FIG. 4, the ranging channel is comprised of three parts: ranging cyclic prefix (RCP), ranging preamble (RP) (or sequence portion), and guard time (GT). Assume that there is. Since the GT is a period in which no signal is transmitted, in this case, the ranging channel may be regarded as two parts, RCP and RP. In addition, it is assumed that the time length of the basic ranging channel is equal to the length of one subframe. However, the foregoing assumptions are examples for explaining the present invention, and the configuration of the ranging channel is not limited to the present invention. For example, the ranging channel may be configured with a plurality of ranging opportunities over physical resources that do not overlap. In addition, the ranging channel may be configured to have a time length longer than one subframe.

The ranging channel illustrated in FIG. 4 (a) is composed of 'RCP + RP (+ GT)'. The ranging channel illustrated in FIG. 4 (b) is composed of 'RCP + RP + RCP + RP (+ GT)' and has a structure in which 'RCP + RP' is repeated. Each terminal may be configured to transmit the entire signal corresponding to 'RCP + RP + RCP + RP', or to interpret two 'RCP + RP' as a separate ranging opportunity to select and transmit only one of the two It may be configured. The ranging channel illustrated in FIG. 4 (c) is composed of 'RCP + RP + RP (+ GT)' and has a structure in which 'RP' is repeated.

Embodiment 1: using a non-transmission time interval located before or after a subframe

In the basic ranging channel structure illustrated in FIG. 4, the ranging channel may be configured using a non-transmission time interval by increasing the length of at least one of RCP, GT, and RP (or a sequence portion) than the basic time length. Specifically, the ranging channel may be configured over a longer time range than the basic ranging channel by including one or more of an idle time, an idle symbol, a TTG, and an RTG. In other words, the total time length of the ranging channel may be configured to be longer than the length of one subframe. Using this technique, the total time length of the ranging channel can be configured as 'time length of subframe + length of non-transmission time interval'. In general, the RCP is determined by the sum of the maximum round trip delay (RTD) and the maximum delay spread for the maximum supportable cell radius. The ranging GT is determined by the maximum RTD for the maximum supportable cell radius. Thus, by increasing the length of the RCP and / or GT, it is possible to increase the maximum supportable cell radius. Conversely, when increasing the length of the RP, it is possible to increase the energy (SNR or Ep / N0) of the ranging signal received by the base station. Since the maximum power is limited for uplink transmission by the terminal, an increase in the received energy may increase cell coverage. Thus, increasing the time length of the RCP and / or GT may increase the supportable cell coverage in terms of time delay, and increasing the time length of the RP may increase the supportable cell coverage in terms of the required energy. For example, it is possible to increase the maximum supportable cell coverage with respect to a terminal and / or path loss / propagation loss in a bad channel state.

5 and 6 illustrate an example of configuring a ranging channel using an idle time or an idle symbol in TDD and FDD modes when T _CP = 1/8 · T _u . 7 and 8 illustrate an example of configuring a ranging channel using TTG, RTG or idle time in TDD and FDD modes when T _CP = 1/16 · T _u . 5-8, the non-transmission time interval in the TDD mode includes a DL / UL or UL / DL switching time set to TTG / RTG in a frame. In the FDD mode, the non-transmission time interval includes the remaining time interval remaining in the frame in consideration of the subframe configuration. Non-transmission time intervals can also be used for noise or interference measurements, and are generally preferred to be allocated at the end of the frame or after the subframe, but this does not limit its position. The non-transmission time interval may have different parameter values according to the CP length or the use / configuration of the subframe (MBS, mixed CP scenario).

Assuming that the basic structure of the ranging channel is set to RCP + RP (s) + GT in the TDD mode, the ranging channel may be set using TTG / RTG as a non-transmission time. The ranging channel considering TTG / RTG may not set RCP or GT. Since TTG / RTG is determined in consideration of RTD, ranging coverage (ie, RCP or GT) is correlated with TTG / RTG. As a result, the ranging channel can be set to the structure of RP (s) + GT or RCP + RP (s) without ultimately setting RCP or GT. The ranging opportunity using the non-transmission time interval in the TDD mode is preferably set to a specific UL last subframe of each frame. Since the non-transmission time interval is added after the last subframe of every frame in the FDD mode, establishing a ranging opportunity in the last UL subframe of the frame in the TDD mode can be easily extended to the FDD mode. Therefore, the ranging opportunity using the non-transmission time interval in the FDD mode may be set in the last subframe of every frame. Also, in the FDD mode, when the non-transmission time interval exists at any position in the frame, the ranging opportunity is placed in a subframe located before or after the non-transmission time interval, or in a subframe including the non-transmission time interval. It is preferable.

In the above, the case where all the non-transmission time intervals are used has been described, but this is an example for explaining the concept, and it is preferable to configure the ranging channel using a portion of the non-transmission time intervals. This will be described in detail with reference to FIGS. 9 and 10.

FIG. 9 illustrates a difference between transmission and reception times of a base station and a terminal due to propagation delay of a DL / UL signal with respect to an absolute time in a TDD structure. In FIG. 9, it is assumed that TTG is equal to the sum of RTD and SSRTG. The above assumption is an example for explaining the invention, and the TTG may be equal to or larger than the sum of the RTD and the SSRTG. In the description of FIG. 9, an RTD means a maximum RTD that can be generated according to a cell size.

Referring to FIG. 9, the base station transmits a DL signal at a point in time. At this time, a DL propagation delay occurs according to the distance from the base station to the terminal. A terminal very close to the base station may receive the DL signal without time delay as in Case 0-1. On the other hand, the terminal farthest from the base station in the cell receives the DL signal delayed by the time of RTD / 2 as in Case 0-2. That is, depending on the distance from the base station, each terminal receives a DL signal with a time delay between 0 and RTD / 2. In this way, each terminal is synchronized with the DL at the relative time when the DL signal is reached to itself, not the absolute time. Each terminal transmits an initial ranging signal to the UL, assuming that the UL is the same as the DL synchronization after the DL synchronization. This time point is shown at point 2. Since each UE starts ranging signal transmission under DL synchronization, in view of absolute time, the UL ranging signal transmitted from each UE may have a different transmission start time. The ranging signal transmitted by each terminal has a UL propagation delay to reach the base station. The absolute time of reaching the base station through this time delay is shown at point 3. Signals of a terminal very close to the base station may be received at the base station with almost no time delay as in Case 1-1. On the other hand, the signal of the terminal farthest away from the base station in the cell is received by the base station with a delay of RTD / 2 time as in Case 1-2. That is, according to the distance from the base station, the signal of each terminal is received by the base station with a UL time delay between 0 and RTD / 2. Considering both the DL propagation delay and the UL propagation delay, the round trip signal between the base station and the terminal undergoes a propagation delay between 0 and RTD.

In general, a terminal attempting initial access adjusts DL synchronization using a DL preamble and then receives a broadcast channel. Thereafter, the terminal attempts initial access using the received system information. In addition, since a broadcast channel is generally located in a preceding subframe within a frame, it may have time to switch from DL to UL before attempting initial access without considering SSRTG. However, a special case may not be possible. For example, if IEEE 802.16e and IEEE 802.16m DL are distinguished in the form of TDD, and an IEEE 802.16m subframe is located behind, a broadcast channel may be located in the last subframe. In such a case, after receiving the broadcast channel, it does not have sufficient switching time before transmitting the initial ranging. Therefore, it is preferable that the initial ranging channel starts transmitting with a time offset of SSRTG at the end of the DL subframe. Case 2-1 and Case 2-2 show an example of starting transmission of a UL ranging channel with an offset of SSRTG after DL synchronization is synchronized.

Referring to the section of the front time RTD / 2 of the TTG in FIG. 9, it can be seen that the DL signal and the UL signal exist simultaneously. Even if the DL signal and the UL signal exist simultaneously in absolute time, each signal may experience different propagation delay and thus may not interfere with each other. However, when considering propagation delay due to obstacles in the non-line of sight (NLOS) (i.e., when the DL synchronization of UEs in adjacent locations is slightly different in absolute time), the DL signal and the UL The mixing of signals can act as interference with each other. In order to prevent such interference, it may be considered that the transmission time of the UL ranging signal is given an offset of at least RTD / 2 time from the start time of the TTG.

FIG. 10 shows an example of giving an offset of the RTD / 2 or RTD / 2 + SSRTG time from the start time of the TTG after the UE synchronizes the DL.

Referring to FIG. 10, the base station transmits a DL signal at point 1. DL propagation delay occurs according to the distance from the base station to the terminal. A terminal very close to the base station may receive the DL signal without time delay as in Case 0-1. On the other hand, the terminal that is far away from the base station in the cell receives a signal delayed by the time of RTD / 2 as in Case 0-2. That is, depending on the distance from the base station, each terminal receives a DL signal with a time delay between 0 and RTD / 2. In this way, each terminal is synchronized with the DL at the relative time when the DL signal is reached to itself, not the absolute time. After each UE synchronizes DL synchronization, it assumes that UL is equal to DL synchronization, and transmits an initial ranging signal to UL. This time point is shown at point 2. Since each UE starts ranging signal transmission under DL synchronization, it can have a different transmission start time in absolute time.

The ranging signal transmitted by the terminal experiences a UL propagation delay while reaching the base station. The absolute time to reach the base station via the time delay is shown in point 3. Signals of a terminal very close to the base station may be received at the base station with almost no time delay as in Case 1-1. On the other hand, the signal of the terminal that is far away from the base station in the cell may be received by the base station with a delay of RTD / 2 time as in Case 1-2. That is, according to the distance from the base station, the signal of each terminal is received by the base station with a UL time delay between 0 and RTD / 2. Considering both the DL propagation delay and the UL propagation delay, the round trip signal between the base station and the terminal undergoes a propagation delay between 0 and RTD. In this case, if a UL offset channel transmission is started with a time offset of RTD / 2 or more, it is possible to prevent a situation in which DL and UL are simultaneously transmitted on the same absolute time illustrated in FIG. 9. In Cases 3-1 and 3-2, the UE starts the UL ranging channel transmission with a time offset of RTD / 2. In Cases 4-1 and 4-2, the UE starts UL ranging channel transmission with a time offset of 'RTD / 2 + SSRTG' in order to ensure sufficient switching time.

In cases 3-1 and 3-2 of FIG. 10, a possible length of the ranging signal may be calculated. A ranging channel consisting of three parts, RCP, RP, and GT, can be included in the time domain after subtracting the time of 'RTD / 2' from the total time length of '1 TTG + 1 subframe'. Hereinafter, a method of obtaining the lengths of the RCP and the RP will be concretely illustrated by using the equation.

As an example, when the ranging channel is configured as 'RCP + RP + GT', the length of the RP may be calculated as follows.

As another example, when the ranging channel is configured as 'RCP + RP + RCP + RP + GT', the length of the RP may be calculated as follows.

If the length of the RP is determined first with different criteria, the length of the RCP and the GT can be obtained using the length of the RP. For example, when the ranging channel is configured as 'RCP + RP + GT', the RCP and the GT may have the following lengths.

As another example, when the ranging channel is configured as 'RCP + RP + RCP + RP + GT', the RCP and the GT may have the following lengths.

The UE may not directly know the value of the maximum supportable RTD in a particular cell. However, since the UE knows all the lengths of the TTG, SSRTG and one subframe, the RTD _max can be calculated as follows using the parameter.

The time length of the TTG can be longer than RTD + SSRTG. In this case, since the RTD obtained by the calculation has a longer time than the actual RTD, when the transmission start time of the ranging channel is started by giving the RTD / 2 time offset from the TTG start time using the calculated RTD, DL The effect of preventing the transmission of the and UL at the same time can be sufficiently obtained.

It may also occur if the time length of the TTG is shorter than RTD + SSRTG. For example, in the case of having a 100 km cell radius, the TTG may be configured by shortening the RTD _max of the above equation to the actual RTD in order to reduce overhead. In this case, if the calculated RTD is used to give the time offset as much as RTD / 2 at the start of the TTG, it may be hard to see the effect of preventing the DL and the UL from being transmitted at the same time. However, due to the short TTG, there is a time interval in which DL and UL signals exist simultaneously in the data channel. Thus, the problem with the short TTG is not related to the ranging channel but the performance of the basic overall system. Therefore, the configuration of the ranging channel does not matter.

When the ranging channel starts transmitting the ranging signal with a time offset of 'RTD / 2' at the start time of the TTG or the last time of the DL subframe, the T in the ranging channel configured with 'RCP + RP + GT' _{The RCP} can be calculated as follows. Here, it may be calculated as RTD = TTG-SSRTG.

2 of the above formula of the formula may be said to have an offset to indicate that the T defining the length of the T _{RCP RCP} has a length of RTD supported by the frame structure, does not change the length of the T _RCP. Alternatively, the following formula is offset to obtain the length T _RCP within has a length of predetermined length T _RCP T _RP, one with a TTG available in consideration of the offset time length of the subframe length of time (in this case RTD 2) The length of the T _RCP is changed by the length.

On the other hand, if the ranging channel is composed of 'RCP + RP + RCP + RP + GT', T _RCP can be calculated as follows.

2 of the above formula of the formula may be said to have an offset to indicate that the T defining the length of the T _{RCP RCP} has a length of RTD supported by the frame structure, does not change the length of the T _RCP. In contrast, the following equation is obtained by calculating the length of the T _RCP within the time length of the available TTG and the time length of one subframe by taking the length of the T _RCP into a predetermined length of the T _RP . 2) The length of the T _RCP is changed by the length.

In addition, to express T _RCP in system sampling rate units, it can be calculated as follows.

2 of the above formula of the formula may be said to have an offset to indicate that the T defining the length of the T _{RCP RCP} has a length of RTD supported by the frame structure, does not change the length of the T _RCP. Alternatively, the following formula is offset to obtain the length T _RCP within has a length of predetermined length T _RCP T _RP, one with a TTG available in consideration of the offset time length of the subframe length of time (in this case RTD 2) The length of the T _RCP is changed by the length.

10, case 4-1 and 4-2, the three parts of the RCP, RP and GT in the time domain after subtracting the time of 'RTD / 2 + SSRTG' from the total time length of '1 TTG + 1 subframe' It can put a ranging channel having a. The details are similar to those described in cases 3-1 and 3-2.

If the ranging channel is transmitted with a time offset of 'RTD / 2 + SSRTG' at the start time of the TTG or the last time of the DL subframe, the T _RCP in the ranging channel configured with 'RCP + RP + GT' is It can be calculated as RTD can be calculated as RTD = TTG-SSRTG.

2 of the above formula of the formula may be said to have an offset to indicate that the T defining the length of the T _{RCP RCP} has a length of RTD supported by the frame structure, does not change the length of the T _RCP. Alternatively, the following formula is offset to obtain the length T _RCP within has a length of predetermined length T _RCP T _RP, one with a TTG available in consideration of the offset time length of the subframe length of time (in this case RTD 2) The length of the T _RCP is changed by the length.

On the other hand, to represent the T _RCP in the system sampling rate unit can be calculated as follows.

2 of the above formula of the formula may be said to have an offset to indicate that the T defining the length of the T _{RCP RCP} has a length of RTD supported by the frame structure, does not change the length of the T _RCP. Alternatively, the following formula is offset to obtain the length T _RCP within has a length of predetermined length T _RCP T _RP, one with a TTG available in consideration of the offset time length of the subframe length of time (in this case RTD 2) The length of the T _RCP is changed by the length.

On the other hand, if the ranging channel is composed of 'RCP + RP + RCP + RP + GT', T _RCP can be calculated as follows.

2 of the above formula of the formula may be said to have an offset to indicate that the T defining the length of the T _{RCP RCP} has a length of RTD supported by the frame structure, does not change the length of the T _RCP. Alternatively, the following formula is offset to obtain the length T _RCP within has a length of predetermined length T _RCP T _RP, one with a TTG available in consideration of the offset time length of the subframe length of time (in this case RTD 2) The length of the T _RCP is changed by the length.

In addition, to calculate the T _RCP in the system sampling rate unit, it can be calculated as follows.

2 of the above formula of the formula may be said to have an offset to indicate that the T defining the length of the T _{RCP RCP} has a length of RTD supported by the frame structure, does not change the length of the T _RCP. Alternatively, the following formula is offset to obtain the length T _RCP within has a length of predetermined length T _RCP T _RP, one with a TTG available in consideration of the offset time length of the subframe length of time (in this case RTD 2) The length of the T _RCP is changed by the length.

In the above, the method for obtaining the RCP when using the TTG interval in the TDD mode is described. In order to reduce interference when a simple implementation of a terminal and a base station and different configurations are used in adjacent cells, the lengths of the RPs are preferably the same. On the other hand, when the TTG interval is not used in the FDD mode or the TDD mode, there will be information broadcast in relation to the length of the RCP, RP. In this case, it is possible to recalculate the information broadcast from the base station and calculate the ranging channel length when using the TTG section in the TDD mode.

The format of the ranging channel may be configured as shown in Table 4. The value of each parameter is expressed in units of sampling time, and the sampling time unit is assumed to be T _stu = 1 / (10937.5 × 2048) seconds.

Here, RCP, RP, T _RCP , T _RP , T _g and T _stu are as described above, Δf _RP represents the subcarrier spacing of the ranging channel, and k is defined as follows.

Here, N _sym , T _s , T _RP , T _g and T _stu are as described above.

The format number of Table 4 may always be broadcast regardless of the FDD / TDD mode. If the FDD mode is broadcast, the UE can use all the values of Table 4. The UE gives an offset by the TTG time from the end time of the last DL subframe in the frame or starts the ranging signal transmission at the start time of the UL subframe based on the relative time of DL synchronization. The format number of Table 4 may always be broadcast regardless of the FDD / TDD mode. If the FDD mode is broadcast, the UE can use all the values of Table 4. The UE gives an offset by the TTG time from the end time of the last DL subframe in the frame or starts the ranging signal transmission at the start time of the UL subframe based on the relative time of DL synchronization. However, when the TDD mode is broadcast, the terminal may use Δf _RP and T _RP as defined in Table 4 as it is, and reinterpret the value of the T _RCP as follows.

TDD 1-1. If you give a time offset of SSRTG

혹은

로 표현될 수 있다. 이 경우, T_RCP는 다음과 같이 계산될 수 있다.The UE starts the ranging channel transmission after offsetting SSRTG from the end time of the last DL subframe in the frame based on the relative time of DL synchronization. In such a case, if each ranging channel is allocated to the first and second UL subframes, there will be a problem in that the transmission time is increased by using some time in the TTG when the ranging channel is transmitted in the second UL subframe. Can be. In order to solve this problem, it is possible to give an offset as much as TTG-SSRTG at the start time of the corresponding UL subframe, rather than giving an offset following SSRTG at the end time of the DL subframe. In this manner, a plurality of ranging channels longer than one subframe may be allocated in the time domain. The time offset is in system sampling rate

or

It can be expressed as. In this case, T _RCP can be calculated as follows.

T _RCP = TTG - SSRTG or T _RCP = TTG - SSRTG + T _g

In addition, when the ranging structure is assumed to be 'RCP + RP + GT', T _RCP may be calculated as follows in units of basic sampling units.

In addition, when the ranging structure is assumed to be 'RCP + RP + RCP + RP + GT', T _RCP may be calculated as follows.

TDD 1-2. Gives a time offset of RTD / 2

또는

로 표현될 수 있다. 이 경우, T_RCP는 다음과 같이 계산될 수 있다.The UE starts the ranging channel transmission after offsetting (TTG-SSRTG) / 2 from the end time of the last DL subframe in the frame based on the relative time of DL synchronization. The time offset is in system sampling rate

or

It can be expressed as. In this case, T _RCP can be calculated as follows.

T _RCP = ( TTG - SSRTG ) / 2 × 2 or T _RCP = ( TTG - SSRTG ) / 2 × 2 + T _g

In addition, when the ranging structure is assumed to be 'RCP + RP + GT', T _RCP may be calculated as follows in units of basic sampling units.

In addition, when the ranging structure is assumed to be 'RCP + RP + RCP + RP + GT', T _RCP may be calculated as follows.

TDD  1-3: RTD / 2 + SSRTG Gives a time offset of

또는

로 표현될 수 있다. 이 경우, T_RCP는 다음과 같이 계산될 수 있다.The UE starts the lane channel transmission after offsetting (TTG-SSRTG) / 2 + SSRTG from the end time of the last DL subframe in the frame based on the relative time of DL synchronization. In such a case, when each ranging channel is allocated to the first and second UL subframes, there may be a problem in that the transmission time is increased by using some time in the TTG when the ranging channel is transmitted in the second UL subframe. Can be. To solve this problem, instead of giving an offset following (TTG-SSRTG) / 2 + SSRTG at the end time of the DL subframe, it is advanced by (TTG-SSRTG) / 2 at the start time of the corresponding UL subframe. It is possible to give an offset. In this manner, a plurality of ranging channels longer than one subframe may be allocated in the time domain. The time offset is in system sampling rate

or

It can be expressed as. In this case, T _RCP can be calculated as follows.

T _RCP = ( TTG - SSRTG ) / 2 × 2 + SSRTG or T _RCP = ( TTG - SSRTG ) / 2 × 2 + SSRTG + T _g

In addition, when the ranging structure is assumed to be 'RCP + RP + GT', T _RCP may be calculated as follows in units of basic sampling units.

In addition, when the ranging structure is assumed to be 'RCP + RP + RCP + RP + GT', T _RCP may be calculated as follows in units of basic sampling units.

The format of the ranging channel may be configured as shown in Table 5. The value of each parameter is expressed in units of sampling time, and the sampling time unit is assumed to be T _stu = 1 / (10937.5 × 2048) seconds.

Here, RCP, RP, T _RCP , T _RP , T _g and T _stu are as described above, Δf _RP represents the subcarrier spacing of the ranging channel, and k is defined as follows. α may have a value of 0 in the FDD mode and another value in the TDD mode.

Here, N _sym , T _s , T _RP , T _g and T _stu are as described above.

The format number of Table 5 may always be broadcast regardless of the FDD / TDD mode. When the FDD mode is broadcast, the UE can use all the values of Table 5. The UE gives an offset by the TTG time from the end time of the last DL subframe in the frame or starts the ranging signal transmission at the start time of the UL subframe based on the relative time of DL synchronization. However, if the TDD mode is broadcast, the terminal may use Δf _RP and T _RP as defined in Table 5 as it is, and reinterpret the value of T _RCP as follows.

TDD 2-1: When giving the time offset of SSRTG

In the TDD mode, the UE gives an offset by SSRTG time from the end time of the last DL subframe in the frame or an offset of-(TTG-SSRTG) from the start time of the UL subframe based on the relative time of DL synchronization. Start ranging signal transmission. When a ranging format of 'RCP + RP + GT' is used, it may have a value of α = (TTG-SSRTG) / 2. This can be interpreted as equally distributing the time of the ranging channel (including GT) to two (one RCP and one GT) extended by (TTG-SSRTG). When a ranging format of 'RCP + RP + RCP + RP + GT' is used, it may have a value of α = (TTG-SSRTG) / 3. This can be interpreted as equally distributing the time of the ranging channel (including GT) extended by (TTG-SSRTG) to three places (two RCPs and one GT).

TDD 2-2: When giving a time offset of RTD / 2

In the TDD mode, the UE offsets (TTG-SSRTG) / 2 hours from the end time of the last DL subframe in the frame based on the relative time of DL synchronization, or-[(TTG-SSRTG) at the start time of the UL subframe. Offset by the time of) / 2 + SSRTG] and start the ranging signal transmission. When a ranging format of 'RCP + RP (+ GT)' is used, it may have a value of α = [(TTG-SSRTG) + SSRTG] / 2. This can be interpreted as equal distribution of the time of the ranging channel (including GT) to RCP and GT, extended by (TTG-SSRTG) + SSRTG. When a ranging format of 'RCP + RP + RCP + RP (+ GT)' is used, it may have a value of α = [(TTG-SSRTG) + SSRTG] / 3. This can be interpreted as equal distribution of the time of the ranging channel (including GT) to RCP and GT, extended by (TTG-SSRTG) / 2 + SSRTG.

TDD 2-3: gives a time offset of RTD / 2 + SSRTG

In the TDD mode, the UE gives an offset by (TTG-SSRTG) / 2 + SSRTG time from the end time of the last DL subframe in the frame based on the relative time of DL synchronization or-[(TTG) at the start time of the UL subframe. Offset by the time of -SSRTG) / 2] and start the ranging signal transmission. When a ranging format of 'RCP + RP + GT' is used, it may have a value of α = [(TTG-SSRTG) / 2/2]. This can be interpreted as equal distribution of the time of the ranging channel (including GT) to RCP and GT, extended by (TTG-SSRTG) / 2. When a ranging format of 'RCP + RP + RCP + RP + GT' is used, it may have a value of α = [(TTG-SSRTG) / 2/3]. This can be interpreted as equal distribution of the time of the ranging channel (including GT) to RCP and GT, extended by (TTG-SSRTG) / 2.

SSRTG  Or if the value corresponding to the offset is predetermined

In order to apply the structure illustrated in the present invention more efficiently, a value corresponding to the maximum SSRTG that can be supported or a time offset value of a ranging channel may be predetermined. Since the SSRTG value may vary from terminal to terminal, it may be desirable to set one fixed value as the SSRTG in order to apply the structure illustrated in the present invention more efficiently. In WiMAX Forum Mobile System Profile Release 1.0 (Revision 1.4.0), you can use the SSRTG value to ensure MS minimum performance as defined by performance / fidelity requirements. SSRTG to ensure MS minimum performance has a length of 50us (= 1120 × T _stu ). In applying the embodiment according to the present invention, SSRTG may be set to have a fixed value of 50us (= 1120 × T _stu ). The format of the ranging channel may be configured as shown in Table 6. The value of each parameter is expressed in units of sampling time, and the sampling time unit is assumed to be T _stu = 1 / (10937.5 × 2048) seconds.

(a): In formats 0 and 1 the RCP depends on the ORDM parameter and subframe type.

(b): In Format 2, the length of the RP depends on the length of the repeated ranging preamble.

Here, RCP, RP, T _RCP , T _RP , T _g and T _stu are as described above, Δf _RP represents the subcarrier spacing of the ranging channel, and k is defined as follows.

Here, N _sym , T _s , T _RP , T _g, and T _stu are as described above, and α may have a value of 0 in the FDD mode, and T _TTG -1120 × T _stu in the TDD mode. According to the above equation, the ranging channel is FDD by adding a value of α (= T _TTG -1120 x T _stu ) to the length of one subframe in the TDD model, excluding the SSRTG length in the _TTG length. Can be used longer than

Referring to Table 6, in ranging channel format 0, repeated RCP and RP are used as one ranging opportunity by the terminal. In format 1, a single RCP and RP are part of format 0, each of which is used with one ranging opportunity. Format 2 consists of RCP and repeated RP and there is no intermediate RCP that was in Format 0.

In relation to the ranging opportunity, each terminal randomly selects one ranging preamble sequence from the available ranging sequences defined in the corresponding cell. When the ranging structure is format 1, each terminal further selects one of two ranging opportunities in one subframe. If the format is set to 0, 2 or 3, or is set to use the first ranging opportunity in format 1, the ranging channel is transmitted at the start time of the UL subframe in FDD mode, and the last DL subframe in TDD mode is The 1120 × T _stu is transmitted last time from the end. When the second ranging opportunity is configured in format 1, the ranging channel is transmitted after T _RCP + T _RP has passed from the transmission time point of the corresponding UL subframe in FDD mode, and the last DL subframe is finished in TDD mode. T _RCP + T _RP + 1120 × T _stu is transmitted from the time point

In format 3 of Table 6, the length of T _RCP is the same regardless of FDD / TDD. Since the RCP length has already been set to support a 100km cell radius, no further length is needed.

In Format 2 of Table 6, it is also possible to use 'α' instead of 'α + Tg' as the length of the T _RCP . That is, in FDD, the first RP is used as a virtual RCP without an RCP, and only the second RP is used for detection. In TDD, it is possible to use the RCP length and use the repeated RP for detection.

In Format 2 of Table 6, the length of the T _RCP is designed as 'α + Tg' to cover the maximum RTD possible with TTG, assuming that α is the time length of 'TTG-SSRTG'. In this configuration, when considering the same GT length as that of the RTD in the RCP, some time following in time within the entire ranging channel that is added to the time length of one subframe may not be necessary. That is, when considering the ranging channel to the end of the subframe, a GT length more than necessary can be secured. However, since the system does not have to consider time delays beyond the maximum supportable RTD with TTG, it is possible to use this time length of RCP.

Alternatively, it is also possible to set the time length of the maximum delayable RCP in the entire ranging channel by adding α to the time length of one subframe. Format 2 of Table 6 can be used as 'T _g + m × T _stu ' in the form similar to format 0/1 instead of 'α + Tg' as the length of T _RCP . M is defined as follows.

Here, N _sym , T _s , α, T _RP , T _g and T _stu are as described above.

According to the above equation, the length N _sym · T length than the length T _g of the entire lane of RP length 2T _RP and the maximum delay spread of the repeating ranging length of some sections of the TTG length plus α to the one sub-frame by half The divided value can be obtained by RTD. That is, when there is one RCP and one GT in the ranging channel, the maximum possible length of the RTD is equal to m × T _stu . The maximum delay spread plus the length can be used as RCP.

In FDD, m = 0 may be used. That is, in FDD, the first RP can be used as a virtual RCP without an RCP, and only the second RP can be used for detection. In TDD, the length of the RCP is used, and the repeated RP can be used for detection.

Format 2 of Table 6 can be used as 'RCP + RP' in FDD and 'RCP + RP + RP' in TDD. In FDD, the length of the RCP can be equal to the length of the RP or can be determined by the sum of the RTD (200.138457us) and the maximum delay spread (1 / 8T _b : 11.428571us or 1 / 16T _b : 5.714286us) of 30 km cell radius. The length of the RCP in TDD can be determined by α + T _g as in the previous example.

In the above description, the α value may be predetermined as a specific value or may be signaled through a broadcasting channel. It may also be signaled using a predetermined mapping table. For example, if '0' is signaled, the value may be 20us, and '1' may be reserved for future use.

Embodiment 2: Multiplexing with Other Channels Using Non-Transmission Time Intervals

The present invention proposes a method of multiplexing at least two channels. To illustrate the present invention, a method of transmitting a ranging channel and another channel together in a time domain (eg, a subframe) to which the ranging channel is allocated will be described. For convenience, control channels other than ranging channels are referred to as other channels. The other channel includes a control channel, and specifically, may be an uplink feedback channel such as a sounding reference symbol (SRS) and a channel quality indicator (CQI). Other control channels may be assigned a specific time / frequency position from the base station and the time / frequency position may have a period. In addition, the present invention can be applied to multiplexing between ranging channels having different purposes such as initial ranging, handover ranging, periodic ranging, bandwidth request ranging, and the like.

Hereinafter, a method of multiplexing a ranging channel and an SRS will be described in detail with reference to the accompanying drawings. Although the terminal transmitting the SRS and the terminal transmitting the ranging signal each transmit only one channel required by the terminal, the two channels are multiplexed and received in one subframe from the base station.

11 shows an example of multiplexing a lasing channel and an SRS. Even if the time length of the RCP or GT is shorter than the time length of the SRS, the present invention is not limited.

11 (a) shows an example of multiplexing a ranging channel and an SRS using an RCP interval. The SRS may fall within or include an RCP interval. FIG. 11 (a) assumes that the SRS is transmitted overlaid within the RCP time interval. RCP is generally not used for detection at the receiver. Therefore, multiplexing with other channels can be performed using the RCP interval. Because ranging requires low energy requirements (e.g., SNR, Ep / N0), the power per subcarrier of the ranging channel is generally lower than data. Thus, if the power of another channel is greater than the power of the ranging channel, the multiplexed other channels may be hardly affected by the ranging channel. Also, since RCP is generally not used for detection, this multiplexing method does not affect ranging performance.

11 (b) shows an example of multiplexing with a ranging channel and an SRS using a ranging GT section. The SRS may fall within a ranging GT section or may include a ranging GT section. FIG. 11B illustrates a case in which SRSs are overlapped and transmitted in a ranging GT time interval, and illustrates a case in which SRSs are multiplexed to the rearmost OFDM (A) symbol. Since no signal is actually transmitted in the GT section, interference may be present or absent depending on the cell size, unlike interference between the ranging channel and other channels in FIG. 11 (a). In other words, there is no interference between two channels in a small cell without a specific indicator. Ranging generally does not use GT for detection, so having this multiplexing structure does not affect ranging performance. On the other hand, the other channel is not affected by performance because there is no ranging signal coming into the GT when the cell radius is small. However, when the cell radius is large, performance degradation may occur in other channels due to the ranging signal coming into the GT.

11 (c) (d) shows a case in which an SRS is transmitted in a symbol before the RCP or in a symbol after the GP in one subframe. The technique can be accomplished in two ways. First, the time length of the ranging channel may be designed in consideration of the time length of the SRS. In this case, resource waste occurs when the SRS of another UE is not actually transmitted in the subframe to which the ranging channel is allocated. Second, the long length of the ranging channel can be designed without considering the time length of the SRS. In this case, the two channels can be effectively multiplexed by changing the time position at which the ranging signal is transmitted according to the presence of the SRS in the current subframe or the ranging information broadcast in the cell. The Ranging GT is designed to support a somewhat larger cell radius. For example, the ranging GT may be designed to support a cell radius of about 5 km or 10 km. However, most of the cell radius in urban areas, etc. will be much smaller. In addition, the performance of a small cell such as a femto cell or a hot spot is more important. In such a cell, it is possible to move the starting point of the ranging back by using an indicator for the RACH timing. In this case, the effect of shortening the time length of the actual GT is obtained. In the extreme, the time length of the GT may be zero.

Although the above example has been described in units of one subframe, the structure of the ranging channel is not particularly limited for convenience. In addition, as shown in FIGS. 4 to 8, it is also possible to multiplex with a ranging channel configured in consideration of intervals such as idle time, idle symbol, RTG, TTG, and the like. 12 and 13 illustrate an example in which the multiplexing technique is extended to use a non-transmission time interval. 12 and 13 illustrate only the TDD mode having T _CP = 1/8 · T _u , this is for convenience, and the multiplexing method illustrated in the present invention is applicable to the FDD mode, and T _CP = 1/16. · it can be applied to TDD and / or FDD mode, with the T _u. 12 and 13 illustrate a case of including a non-transmission time interval, this is for convenience and it is also possible to multiplex the SRS and the ranging channel only within one subframe without the non-transmission time interval.

In order to support a larger cell radius or to increase the received energy, the ranging channel can be made longer than the length of time of one subframe. FIG. 14 (a) (b) shows an example of multiplexing an SRS to a first or last OFDM (A) symbol in a subframe. In this structure, since the SRS may be transmitted in the middle of the RP, ranging performance may decrease. Therefore, in order to prevent ranging performance deterioration, the receiving end may not use the time domain corresponding to the symbol multiplexed by the SRS for ranging detection. Alternatively, constraints may be placed on SRS transmission. For example, in FIG. 14A, when the SRS is transmitted in the first subframe among the two subframes to which the ranging channel is allocated, the SRS is transmitted as the first OFDM (A) symbol in the subframe. However, when the SRS is transmitted in the second subframe among the two subframes to which the ranging channel is allocated, the SRS transmission may be prohibited. As another example, in FIG. 14B, when the SRS is transmitted in a second subframe among two subframes to which a ranging channel is allocated, the SRS is transmitted as the last OFDM (A) symbol in the subframe. However, when the SRS is transmitted in the first subframe of the two subframes to which the ranging channel is allocated, the SRS transmission may be prohibited. FIG. 14C illustrates a case where an SRS location in a subframe is changed to match a ranging structure. In the figure, it is assumed that the location where the SRS can be transmitted is limited to the RCP, GT interval. Therefore, the degradation of the ranging channel due to the SRS can be completely prevented.

FIG. 15 shows an example of multiplexing a ranging channel having a length of a non-transmission time interval + 2-subframe and another channel. The ranging channel is illustrated as having a structure of 'RCP + RP + RCP + RP + GT'. Referring to FIG. 15, an RCP exists in a first symbol of a subframe in which an SRS is transmitted. On the other hand, since the ranging channel has a longer time length than two subframes and includes an RCP (or GT) in the middle, the SRS can be multiplexed with the ranging channel in all subframes without degrading ranging performance.

In the description of the present invention, only the case in which the ranging channel is generated over two subframes is described.

Concrete example  3-1: TDD  And FDD Mode  Integrated structure for T _CP = 1/8 T _u

When a ranging channel is configured using a non-transmission time interval prior to the UL subframe, such a time domain exists only in the TDD mode and does not exist in the FDD mode, and thus cannot use the same ranging configuration in the TDD and FDD modes. In this case, even if the same downlink signaling, it can be interpreted that the ranging channel is configured using different time lengths and / or frequency lengths according to the duplex mode. For example, in the TDD mode, a longer ranging channel is configured using a non-transmission time interval of a UL subframe, and in a FDD mode, a ranging channel corresponding to one subframe length is used without using a non-transmission time interval. Can be configured.

On the other hand, in order to simply configure the system settings, it can be configured to use the same ranging channel in the TDD and FDD mode. This example is shown in FIG. In the TDD and FDD modes, each subframe has the same length, and a non-transmission time interval is commonly added after the last subframe among UL subframes. Therefore, in order to use the same ranging setting regardless of the duplex mode, the ranging channel may be positioned in the last (late) subframe in the UL subframe in time. When a ranging channel is longer than one subframe, or when multiple ranging channels are allocated to a plurality of subframes in the time / frequency domain, a plurality of UL subframes include the last temporal (late) subframe. Subframes can be used to allocate ranging channels.

In the above description, the ranging configuration includes information on the total time length, bandwidth, RCP, RP, and GT of the ranging channel, and is directly or indirectly transmitted in downlink.

Embodiment 3-2: Integrated Structure for TDD and FDD Modes-T _CP = 1 / 16T _u

When T _CP = 1/16 · T _u , two subframe structures having different time lengths are used as shown in FIG. 17. It is possible to set a ranging channel setting suitable for the length of the two subframes. For example, the ranging configuration for the type-1 subframe and the ranging configuration for the type-2 subframe may be separately set. Alternatively, the ranging channel may be configured to be used only for a specific subframe. For example, the ranging channel may be designed to match the type-1 subframe length. In this case, there is an advantage that the ranging can be attempted immediately at the start of the UL subframe. With this design, the ranging channel may be allocated only to the type-1 subframe, or may be allocated including the type-2 subframe. When a ranging channel is allocated including a type-2 subframe, one remaining symbol may be used to multiplex other control channels such as SRS and CQI described above. As another example, only type-2 subframes may be used for the ranging channel. In this case, although the ranging channel cannot be allocated to the type-1 subframe, the maximum supportable cell coverage of the ranging channel can be increased by using a longer time region of the type-2 subframe.

Embodiment 3-3: T _CP = 1 / 8T _u  And T _CP = 1 / 16T _u Integrated structure for

When T _CP = 1/8 · T _u and when T _CP = 1/16 · T _u , different subframe structures are mixed. In this case, it is possible to set a ranging channel setting suitable for the length of each subframe. On the other hand, in order to simplify the system configuration setting, it is possible to use the same ranging channel in case of _{T CP = 1/8 · T} u and _{T CP = 1/16 · T} u. 18 and 19 show this example.

If T _CP = 1/8 · T _u , the ranging channel is configured to include a non-transmission time interval that appears at the end of the UL subframe. The length of this time domain is about 0.680 ms. When T _CP = 1/16 · T _u , a ranging channel corresponding to the length of the type-2 subframe is configured. The length of this time domain is about 0.680 ms. Therefore, in the case of T _CP = 1/8 · T _u and T _CP = 1/16 · T _u , it is possible to configure a ranging channel having the same length of time. Therefore, it is possible to configure a ranging channel capable of supporting all four modes of FIGS. 18 and 19 with only one ranging channel configuration.

It is also possible to multiplex the other control channels described above. 20 and 21 show an example of multiplexing the SRS to the OFDM (A) symbol in advance of the RCP. The ranging channel is designed in a time domain corresponding to 6 OFDM (A) symbol periods, and the earliest symbol in the subframe may be used for multiplexing with the SRS. With such a structure, it is possible to configure a ranging channel capable of supporting all four cases of FIGS. 20 and 21 with only one ranging setting. Further, by considering multiplexing with the SRS, it is possible to prevent the loss of scheduling due to puncturing of the SRS or the like.

In the above descriptions, since the GT does not actually transmit a signal, it may not be actually defined. In this case, the time length obtained by subtracting the length of the data CP from the RCP may be interpreted as the GT length of the ranging channel. Alternatively, the time domain excluding the length of the RCP and RP in the subframe length or the sum of the subframe length and the non-transmission time interval may be interpreted as GT.

The invention can be applied differently according to the purpose of each channel. In other words, it is possible to apply different methods to initial ranging, handover ranging, periodic ranging, and bandwidth request ranging.

The embodiments described above are the components and features of the present invention are combined in a predetermined form. Each component or feature is to be considered optional unless stated otherwise. Each component or feature may be embodied in a form that is not combined with other components or features. It is also possible to combine some of the components and / or features to form an embodiment of the invention. The order of the operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment or may be replaced with corresponding components or features of another embodiment. It is obvious that the claims may be combined to form an embodiment by combining claims that do not have an explicit citation relationship in the claims or as new claims by post-application correction.

In this document, the embodiments of the present invention have been mainly described with reference to the data transmission / reception relationship between the terminal and the base station. The specific operation described herein as being performed by the base station may be performed by its upper node, in some cases. That is, it is apparent that various operations performed for communication with a terminal in a network including a plurality of network nodes including a base station can be performed by a network node other than the base station or the base station. A 'base station' may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an access point, and the like. In addition, the term "terminal" may be replaced with terms such as a user equipment (UE), a mobile station (MS), an advanced mobile station (AMS), and a mobile subscriber station (MSS).

Embodiments according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof. In the case of a hardware implementation, an embodiment of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), FPGAs ( field programmable gate arrays), processors, controllers, microcontrollers, microprocessors, and the like.

In the case of implementation by firmware or software, an embodiment of the present invention may be implemented in the form of a module, procedure, function, etc. that performs the functions or operations described above. The software code may be stored in a memory unit and driven by a processor. The memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit of the invention. Accordingly, the above detailed description should not be construed as limiting in all aspects and should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention.

The present invention can be applied to a mobile communication system. Specifically, the present invention can be applied to a mobile communication system supporting a Time Division Duplex (TDD) scheme, a Full-Frequency Division Duplex (F-FDD) scheme, or a Half-Frequency Division Duplex (H-FDD) scheme. More specifically, the present invention can be applied to a method of transmitting uplink control information in a mobile communication system.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included as part of the detailed description in order to provide a thorough understanding of the present invention, provide an embodiment of the present invention and together with the description, illustrate the technical idea of the present invention.

1 shows a type-1 frame structure of a TDD mode having T _CP = 1/8 · T _u in IEEE 802.16m.

2 shows a type-1 frame structure of an FDD mode having T _CP = 1/8 · T _u in IEEE 802.16m.

3 shows a frame structure of TDD and FDD modes having T _CP = 1/16 · T _u in IEEE 802.16m.

4 illustrates the structure of a basic ranging channel that can be used in the present invention.

5-6 illustrates an example of configuring a ranging channel using an idle time or an idle symbol in TDD and FDD modes when T _CP = 1/8 · T _u .

7-8 illustrates an example of configuring a ranging channel using TTG, RTG or idle time in TDD and FDD modes when T _CP = 1/16 · T _u .

FIG. 9 illustrates a difference between transmission and reception times of a base station and a terminal due to propagation delay of a DL / UL signal with respect to an absolute time in a TDD structure.

FIG. 10 shows an example in which a time point of transmitting a UL ranging signal is offset from a start time of a TTG after the UE synchronizes DL synchronization.

11-13 illustrate an example of multiplexing a ranging channel and another control channel over one subframe.

14-15 illustrate an example of multiplexing a ranging channel and another control channel over two subframes.

16-17 show configuration examples of the same ranging channel in the TDD / FDD mode.

18-19 illustrate an example of configuring the same ranging channel when different CP lengths are used for each subframe in the TDD / FDD mode.

20-21 shows another example of configuring the same ranging channel when different CP lengths are used for each subframe in the TDD / FDD mode.

Claims (15)

In the method for transmitting uplink control information in a mobile communication system, Generating a control channel including a guard interval for preventing interference with an adjacent channel in a time domain, wherein the control channel is generated to overlap at least a portion of a non-transmission time interval in which a signal is not transmitted or received during communication; And And transmitting control information through the generated control channel. The method of claim 1, The guard interval includes at least one of a cyclic prefix (CP) and a guard time (GT). The method of claim 1, And the control channel further comprises a preamble portion for ranging. The method of claim 1, And the control channel overlaps at least a portion of the non-transmission time interval by extending a time length of a basic control channel. The method of claim 4, wherein The time length of the basic control channel is uplink transmission method of the control information, characterized in that it is defined in a subframe unit containing a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols. The method of claim 1, And the control channel overlaps at least a portion of the non-transmission time interval by adjusting a transmission time of a basic control channel. The method of claim 1, The mobile communication system performs communication using a super-frame, One superframe consists of a plurality of frames, each frame consists of a plurality of subframes, each subframe includes a plurality of Orthogonal Frequency Division Multiple Access (OFDMA) symbols, The non-transmission time interval is an uplink transmission method of control information, characterized in that added to the inside or the end of the frame. The method of claim 7, wherein The non-transmission time interval includes an idle time, an idle symbol, a RTG (Receive / transmit Transitioin Gap), or TTG (Transmit / receive Transitioin Gap). . The method of claim 1, Transmitting control information through the generated control channel, The uplink transmission method of the control information, characterized in that performed after a predetermined time elapses from the start of the non-transmission interval. 10. The method of claim 9, The predetermined time is uplink transmission method of the control information, characterized in that is selected from SSRTG (Subscriber Station Receive / Transmit Gap), RTD (Round Trip Delay) / 2 RTD / 2 + SSRTG. The method of claim 1, The control channel is uplink transmission method of the control information, characterized in that located in the last subframe of the plurality of subframes included in the uplink transmission region. The method of claim 1, And the control channel is multiplexed in the same subframe as a separate control channel. The method of claim 12, The separate control channel is uplink transmission method of the control information, characterized in that the multiplexing in the guard interval of the control channel. The method of claim 12, And the control channel and the separate control channel are multiplexed so as not to overlap in the time domain. The method of claim 1, And the control channel comprises an initial ranging channel, a periodic ranging channel, a handover ranging channel, or a bandwidth request ranging channel.

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