Patent Publication Number: US-2022240241-A1

Title: Random Access Method for Multiple Numerology Operation

Description:
RELATED APPLICATIONS 
     This application is a continuation of U.S. application Ser. No. 17/089,165, which was filed 4 Nov. 2020, which application is a continuation of U.S. application Ser. No. 16/316,316, filed 8 Jan. 2019, and issued as U.S. Pat. No. 10,925,064, which application is a national stage of International Application PCT/EP2017/074647, filed 28 Sep. 2017, which claims the benefit of U.S. Provisional Application No. 62/402,768, filed 30 Sep. 2016, the entire disclosure of each being hereby incorporated by reference herein. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates generally to wireless communication networks with mixed numerology and, more particularly, to random access procedures in mixed numerology wireless communication systems. 
     BACKGROUND 
     Fifth Generation (5G) or Next Radio (NR) wireless communication networks will provide support for multiple types of services using a common Radio Access Network (RAN). Services provided by NR wireless communication networks may, for example, include Enhanced Mobile Broadband (eMBB), Machine-Type Communication (MTC), Massive Machine-Type Communication (mMTC), and Ultra-Reliable Low Latency Communication (URLLC). These services require different Quality of Service (QoS) in terms of delay, data rate, and packet loss rate. For example, URLLC requires low delay and/or high reliability. mMTC, which is often used for infrequent transmission of small packets, typically requires long battery lifetime but does not require low delay or high data rate. eMBB, in contrast, requires high data rates, often with strict requirements on delay but typically less strict than in URLLC. 
     In order to fulfil the QoS requirements (e.g., delay) for different services, it has been proposed to introduce mixed numerologies in one carrier so that the services mentioned above can be served over one carrier. In mixed numerology systems, the component carrier can be divided into two or more sub-bands with different numerologies to support services with different QoS requirements. The subcarrier spacing in a sub-band can be 2{circumflex over ( )}n×15 kHz, where n is configurable. Therefore, there is a need for random access procedures that can accommodate NR systems or other wireless communication networks using mixed numerology. To date, little consideration has been given to random access procedures in NR systems or other wireless communication networks using mixed numerology. 
     SUMMARY 
     The present disclosure introduces methods and apparatus for configuring or preconfiguring random access procedures when there are multiple configurable numerologies for one carrier. In some embodiments, the random access numerology of the wireless device is configured using the System Information Block (SIB). In other embodiments, the random access numerology used by the wireless device is determined implicitly based on the detection of one or more synchronization (SYNC) signals. 
     Exemplary embodiments of the disclosure comprise methods implemented by a wireless device of random access in a wireless communication network supporting multiple numerologies. More specifically, the methods may be employed in mixed numerology systems using one numerology for random access and a different numerology for at least one data channel. 
     According to one exemplary method, the wireless device receives System Information (SI) from a base station or other network node in the wireless communication network. The SI contains configuration information indicating a configuration for random access. Based on the configuration information received in the SI, the wireless device determines a numerology for random access. The method further comprises performing random access on a sub-band configured according to the determined numerology to establish a connection with the base station. In some embodiments, the method further comprises transmitting user data to the base station or other network node on a shared Uplink (UL) channel. 
     According to another exemplary method, the wireless device receives SI from a base station or other network node in the wireless communication network. The SI contains configuration information indicating a configuration for random access. Based on the configuration information received in the SI, the wireless device determines a first numerology for random access. The method further comprises performing random access on a sub-band configured according to the first numerology to establish a connection with the base station. After establishing the connection with the network node, the wireless device switches to a second sub-band configured according to a second numerology for data transmission on a shared UL channel. In some embodiments, the method further comprises transmitting user data to the base station or other network node on a shared UL channel. 
     According to another exemplary method, the wireless device receives SI from a base station or other network node in the wireless communication network. The SI contains configuration information indicating a numerology for random access. The method further comprises performing random access on a sub-band configured according to the indicated numerology to establish a connection with the base station. The indicated numerology enables the base station or other network node to process a random access preamble and subsequent transmission on a shared UL channel using common processing hardware. In some embodiments, the method further comprises transmitting user data to the base station or other network node on the shared UL channel. 
     According to another exemplary method, the wireless device receives SI from a base station or other network node in the wireless communication network. The SI contains configuration information indicating a configuration for random access. Based on the configuration information received in the SI, the wireless device determines a default numerology for random access. The method further comprises performing a random access on a sub-band configured according to the default numerology to establish a connection with the base station. After establishing the connection with the network node, the wireless device switches to a second sub-band configured according to a second numerology for data transmissions. 
     According to another exemplary method, the wireless device receives SI from a base station or other network node in the wireless communication network. The SI contains configuration information indicating two or more available numerologies for random access. Based on the configuration information received in the SI, the wireless device selects one of the available numerologies for random access. The method further comprises performing random access using the selected numerology. In some embodiments, the method further comprises, after performing the random access, switching to a sub-band configured according a different numerology for data transmission. 
     According to another exemplary method, the wireless device detects one or more synchronization signals transmitted by the base station or other network node. The wireless device determines one or more available numerologies from the detected synchronization signals and performs a random access on a sub-band configured according to one of said available numerologies to establish a connection with the base station or other network node. 
     Other embodiments of the disclosure comprise wireless devices configured to perform the random access methods described above. In some embodiments, the wireless device comprises an interface circuit for communicating with a network node in the wireless communication network and a processing circuit configured to perform the random access methods. In some embodiments, the wireless device further comprises memory storing program code that when executed by the processing circuit in the wireless device causes the wireless device to perform the random access methods as noted above. 
     Other embodiments of the disclosure comprise a computer program product comprising executable instructions that, when executed by a processing circuit in a wireless device, causes the wireless device to perform any one of the random access methods as noted above. Still other embodiments comprise a carrier containing the computer program product. The carrier may comprise one of an electronic signal, optical signal, radio signal, or computer readable storage medium. 
     Other embodiments comprise methods of random access implemented by a base station or other network node in a wireless communication network supporting multiple numerologies. According to one exemplary method, the base station or network node transmits SI to wireless devices in an area served by the base station or other network node. The SI contains configuration information for random access enabling the wireless devices in the service area of the base station to determine a first numerology for random access. The base station or other network node monitors a random access channel in one or more sub-bands configured according to the available numerology or numerologies. 
     According to one exemplary method, the base station or network node transmits SI to wireless devices in an area served by the base station or other network node. The SI contains configuration information for random access enabling the wireless devices in the service area of the base station to determine a first numerology for random access. The base station or other network node monitors a random access channel configured according to the first numerology. In one embodiment, the random access method implemented by the base station further comprises receiving a random access preamble from the wireless device on a first sub-band configured according to the first numerology and receiving an UL transmission from the wireless device on a shared UL channel configured according to a second numerology different from the first numerology. 
     According to another exemplary method, the base station or other network node in the wireless communication network transmits SI to wireless devices in an area served by the base station or other network node. The SI contains configuration information including two or more available numerologies for random access. The base station or network node monitors one or more random access channels in sub-bands configured according to the available numerologies. In some embodiments, the random access method implemented by the base station further comprises receiving a random access preamble from the wireless device on a sub-band configured according to one of the available numerologies. 
     According to another exemplary method, the base station or other network node in the wireless communication network transmits SI to wireless devices in an area served by the base station or other network node. The SI contains configuration information indicating a numerology for random access. The base station or other network node monitors a random access channel configured according to the indicated numerology. In some embodiments, the base station subsequently receives a preamble transmitted on the random access channel using processing hardware adapted to receive data transmissions from the wireless device on a shared UL channel. 
     Other embodiments of the disclosure comprise a base station or other network node configured to perform the random access methods described above. In some embodiments, the base station or network node comprises an interface circuit for communicating with wireless devices in the wireless communication network and a processing circuit configured to perform the random access methods. In some embodiments, the base station or network node further comprises memory storing program code that when executed by the processing circuit in the wireless device causes the wireless device to perform the random access methods as noted above. 
     Other embodiments of the disclosure comprise a computer program product comprising executable instructions that, when executed by a processing circuit in a base station or network node, causes the base station or network node to perform any one of the random access methods as noted above. Still other embodiments comprise a carrier containing the computer program product. The carrier may comprise one of an electronic signal, optical signal, radio signal, or computer readable storage medium. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  illustrates a wireless communication network supporting two or more sub-bands with different numerologies. 
         FIG. 2  illustrates an example of mixed numerologies. 
         FIGS. 3 a -3 c    illustrate possible configurations of the Discovery Reference Signal (DRS) in a mixed numerology wireless communication network. 
         FIG. 4  illustrates a first exemplary method of random access implemented by a wireless device in a mixed numerology wireless communication network. 
         FIG. 5  illustrates a second exemplary method of random access implemented by a wireless device in a mixed numerology communication network. 
         FIG. 6  illustrates a third exemplary method of random access implemented by a wireless device in a mixed numerology communication network. 
         FIG. 7  illustrates a fourth exemplary method of random access implemented by a wireless device in a mixed numerology communication network. 
         FIG. 8  illustrates a fifth exemplary method of random access implemented by a wireless device in a mixed numerology communication network. 
         FIG. 9  illustrates an exemplary wireless device configured for operation in a mixed numerology wireless communication network. 
         FIG. 10  illustrates a sixth exemplary method of random access implemented by a wireless device in a mixed numerology wireless communication network. 
         FIG. 11  illustrates a wireless device according to another embodiment configured for operation in a mixed numerology wireless communication network. 
         FIG. 12  illustrates a first exemplary method of random access implemented by a base station or other network node in a mixed numerology wireless communication network. 
         FIG. 13  illustrates a second exemplary method of random access implemented by a base station or other network node in a mixed numerology wireless communication network. 
         FIG. 14  illustrates a third exemplary method of random access implemented by a base station or other network node in a mixed numerology wireless communication network. 
         FIG. 15  illustrates a fourth exemplary method of random access implemented by a base station or other network node in a mixed numerology wireless communication network. 
         FIG. 16  illustrates an exemplary network node (e.g., base station) configured for operation in a mixed numerology wireless communication network. 
         FIG. 17  illustrates another exemplary method of random access implemented by a base station or other network node in a mixed numerology wireless communication network. 
         FIG. 18  illustrates a network node (e.g., base station) according to another embodiment configured for operation in a mixed numerology wireless communication network. 
         FIG. 19  illustrates a wireless device according to another embodiment configured for operation in a mixed numerology wireless communication network. 
         FIG. 20  illustrates a wireless device according to another embodiment configured for operation in a mixed numerology wireless communication network. 
         FIG. 21  illustrates a network node (e.g., base station) according to another embodiment configured for operation in a mixed numerology wireless communication network. 
         FIG. 22  illustrates a network node (e.g., base station) according to another embodiment configured for operation in a mixed numerology wireless communication network. 
     
    
    
     DETAILED DESCRIPTION 
     Turning now to the drawings,  FIG. 1  illustrates an exemplary wireless communication network  10  supporting mixed numerologies for user data transmissions. The communication network  10  comprises a plurality of cells  12 , though only one cell  12  is shown in  FIG. 1 . A base station  20  within each cell  12  communicates with the wireless devices within the cell  12 , which are indicated generally by the numeral  30 .  FIG. 1  illustrates three (3) wireless devices  30 : an eMBB device  30   a  configured for MBB communications, a mMTC device  30   b  configured for MTC, and an URLLC device  30   c  configured for URLLC. The base station  20  communicates with the wireless devices  30  over a single component carrier that is divided into sub-bands configured according to different numerologies. In this example, the base station  20  communicates with the eMBB device  30   a , mMTC device  30   b , and URLLC device  30   c  over data channels in first, second, and third sub-bands respectively, which are configured according to different numerologies. 
     For illustrative purposes, an exemplary embodiment of the present disclosure will be described in the context of a NR communication network. Those skilled in the art will appreciate, however, that the present invention is more generally applicable to other wireless communication networks  10  supporting mixed numerology for user data transmissions. 
       FIG. 2  shows an example of mixed numerologies over one Component Carrier (CC)  50 . More particularly,  FIG. 2  illustrates two sub-bands  52  denoted respectively as Sub-Band 1 (SB1) and Sub-Band 2 (SB2). SB1 is configured with relatively narrow subcarrier spacing (e.g., 15 kHz) and a relatively long symbol period compared to SB2. SB2 is configured with a relatively wide subcarrier spacing (e.g., 60 kHz) and a relatively short symbol period compared to SB1. 
       FIGS. 3A-3C  illustrate possible configurations of the Discovery Referenced Signal (DRS) in a wireless communication network  10  supporting mixed numerology for user data transmissions. The DRS comprises a set of signals that can be used, for example, for cell or Transmission and Reception Point (TRP) discovery and identification, at least coarse time and frequency synchronization, and mandatory SI acquisition for initial random access. The DRS may include a Master Information Block (MIB) similar to Long-Term Evolution (LTE) systems, Mobility Reference Signal (MRS) and Channel Status Information Reference Signals (CSI-RS). Also Signature Sequences (SS) used in the process of acquiring minimum system information may be included in the DRS. In NR networks, the DRS corresponds to the Synchronization Signal Block (SSB). 
       FIGS. 3A-3C  show different DRS configurations for a component carrier  50  having two sub-bands  52 .  FIG. 3A  shows the two sub-bands (or RAN slices)  52  of different numerologies sharing the same DRS signal of single numerology. The discovery of the other numerology is determined either by the transmission pattern of DRS signal or the content of DRS. Alternatively, the DRS only sub-band contains information needed for initial system access and information beyond that (such as information related to multiple numerologies) is conveyed to the wireless device  30  using dedicated signaling. This design can save the DRS overhead for mixed numerology operation and simplify the DRS search, but one wireless device  30  which prefers the second numerology shall support the first numerology as well. But the DRS shall be carefully designed so that the wireless device  30  can derive good enough timing for different numerologies. We note that the DRS might be transmitted with a numerology different from both numerology 1 and 2: 3GPP currently discusses to have default DRS numerology for each frequency band or carrier frequency. If the carrier operates with a different numerology than this default numerology (e.g., due to deployment or use case), the DRS numerology is obviously different from numerology 1 and 2. This case is even relevant for a system that operates its carrier with a single numerology different from the default numerology. 
       FIG. 3B  shows two sub-band specific DRSs located in the same part of the carrier bandwidth. The actual sub-band dimension/placement is indicated by the content carried by the respective DRS, e.g., a MIB transmitted as part of the DRS. This design simplifies the DRS search and one wireless device  30  does not have to support multiple numerology operation, but synchronization monitoring performance may be impaired due to the DRS of numerology 2 is not self-contained in the sub-band  52 . Furthermore, the DRS overhead is twice as large as in the first option. 
       FIG. 3C  shows the DRS with multiple numerologies while the DRS of each sub-band  52  is self-contained. There can be certain alignment between DRSs of different numerologies in time domain. The actual sub-band dimension/placement is indicated by the content carried by one of them or the respective DRS. The in band transmission of DRS has good performance of synchronization and Radio Resource Management (RRM) related measurement, but the location of DRS shall be adapted according to the bandwidth dimension/placement between sub-bands and the wireless device  30  may need to take a longer time to search DRS due to the fact that the location of the DRS is not predictable. In this example, the DRS overhead is twice as large as in the first option. 
     Although different DRS examples are presented above, those skilled in the art will appreciate that other DRS configurations are possible. 
     Given the large supported frequency range by NR—from less than-1 GHz to 100 GHz—NR will likely define multiple numerologies. It is currently discussed how DRS/SYNC signal should be configured. One possibility is to connect the DRS signal numerology to the operating frequency/frequency band, irrespective of the numerology used for other transmissions on the carrier. Thus, a carrier using a single numerology may contain a DRS numerology different than the numerology used for data transmissions. 
     Another aspect that requires consideration is how to configure the Random Access Channel (RACH) in a mixed numerology wireless communication network  10 . One possibility is that the wireless communication network  10  may have multiple RACHs using different numerologies. Another possibility is that the wireless communication network  10  may have a RACH configured according to a single numerology while supporting mixed numerologies on traffic channels used for data transmissions. 
     To address issues raised by wireless communication networks  10  using mixed numerologies for data transmissions on traffic channels, the present disclosure describes methods to predefine or preconfigure the random access procedure. In the description below, the numerology is loosely used to refer to the sub-band configured to the numerology. 
     Solution 1: Configure the Wireless Device  30  Random Access Behavior Using the System Information Block. 
     In exemplary embodiments, there may be different configurable random access options. The base station  20  or other network node may include an indicator in the SIB to configure to wireless device  30  to use a particular random access option. Below are some example options for random access procedures: 
     Option 1: Wireless Device  30  Shall Perform Random Access Via Single Numerology. 
     According to this configuration, a wireless device  30  shall first access the wireless communication network  10  via one numerology and then switch to preferred numerology according to wireless device  30  type, traffic type and/or the preconfigured RAN slice selection rules. The numerology for random access can be the predefined default numerology or configured numerology in the system information. 
     As one type of implementation of numerology switch, the wireless device  30  directly switches to the other numerology without Time Advance (TA) correction using the preferred numerology. The TA configuration of one numerology can be directly used for another numerology. Further, it is also applicable to derive the power adjustment of one numerology based on the accumulated power adjustment of another numerology. For this implementation, it is assumed that there is good synchronization between numerology and the Cyclic Prefix (CP) length used in the target numerology can handle the TA inaccuracy. 
     As another implementation of numerology switch, the wireless device  30  may perform numerology switch with a specific TA correction using the Physical Random Access Channel (PRACH) transmission or other UL Sounding Reference Signal (SRS) transmission in UL. Based on the PRACH (or UL SRS) detection, the TA for the target numerology is derived and sent to the wireless device  30  to correct the timing for UL signal transmission. 
     As one example, when the wireless device  30  switches from the first numerology of 15 kHz subcarrier spacing to a second numerology of 60 kHz subcarrier spacing, the second numerology typically requires higher TA accuracy because a shorter CP is used. In this case, the wireless device  30  can be configured to transmit another PRACH (or any other reference signals, e.g., UL SRS) using the second numerology for TA measurement. For the switch in the reverse direction, the wireless device  30  can switch from the numerology with a short CP to a numerology with a longer CP. In this case, specific TA training is not necessary because the TA derived based on the default numerology is good enough. 
     Option 2: Wireless Device  30  Determines the Numerology for Random Access According to the Traffic Type. 
     According to this configuration, a service type to numerology mapping relationship can be preconfigured for a wireless device  30 . When there is session request from the wireless device  30 , the wireless device  30  determines the preferred numerology according to the session type. The wireless device  30  can access the wireless communication network  10  directly via the preferred numerology. In this setup, the SI contains a list of PRACH configurations, one list entry for each (group of) service. As one example, the wireless device  30  that applies for URLLC services can access the wireless communication network  10  via the numerology with wide subcarrier spacing. 
     As another example, some specific wireless device  30  may be designed for specific application case, e.g., wireless device  30  for mMTC or URLLC. For such wireless devices  30 , the wireless device  30  can select the preferred numerology, from a list of numerologies supported by the network, for random access according to the device type or the wireless device  30 . A wireless device  30  especially adapted for mMTC, can access the wireless communication network  10  via the numerology with the narrowest subcarrier spacing (e.g., 3.75 KHz), while a wireless device  30  especially adapted for URLLC may access the wireless communication network  10  via the numerology with the widest subcarrier space (e.g., 60 KHz). 
     Option 3: Wireless Device  30  Adaptively Select the Numerology for Random Access. 
     According to this configuration, the wireless communication network  10  configures the wireless device  30  to select the preferred numerology for random access, i.e., the SI contains a list of supported PRACH numerologies and the wireless device  30  selects the preferred numerology. A wireless device  30  that is nearby a base station  20  or other TRP can select the numerology with wide subcarrier spacing and short Transmission Time Interval (TTI) to reduce the delay for random access. However, for a wireless device  30  that is far from the TRP, the wireless device  30  can select the numerology with narrow subcarrier space and long TTI to improve the robustness of the random access messages. Afterwards, the wireless device  30  can switch to the preferred numerology according to QoS requirements (based on configuration from wireless communication network  10 ). 
     Option 4: Single-Numerology System. 
     One possible setup is a single or multi-numerology carrier where the DRS numerology is different from the numerology(ies) otherwise used on the carrier. One reason for this approach could be that DRS numerology is connected to frequency band or carrier frequency but the carrier operates with another numerology. There are some PRACH preamble design proposals that do not require dedicated PRACH Fast Fourier Transform (FFT) hardware in the receiver but enable reuse of the data channel FFT hardware. In this case the PRACH numerology should preferably match the numerology used for other UL transmissions. A base station  20  or other network node in the wireless communication network  10  may therefore indicate in the SI a PRACH numerology that is the same (or least related in a sense that the PRACH preamble can be processed with the same hardware) as the numerology used for UL transmissions on the carrier. 
     Solution 2: Wireless Device  30  Derive the Random Access Procedure Based on SYNC Signal Monitoring. 
     According to this option, the wireless device  30  derives the numerology for random access based on the detection of the SYNC signal(s). 
     As one example, the wireless device  30  derives the possible numerologies for random access based on the numerology (or numerologies) of the SYNC signal(s). The wireless device  30  selects the numerology that is used for SYNC signal transmission for random access (or derived via a rule from the SYNC numerology). There are different pre-configurations if the SYNC signal has used more than one numerology,
         It can be predefined whether to allow the wireless device  30  to select either one for random access from the numerologies used by SYNC signal; or   It can be predefined that the wireless device  30  selects the preferred one from the numerologies used by SYNC signal according to the wireless device  30  type or service type; or   It can be predefined that the wireless device  30  selects a single fixed numerology for random access. For instance, for SYNC designed as  FIG. 3B , the wireless device  30  shall select numerology of the first part of the SYNC signal (i.e., numerology 1).       

     Whether to allow the wireless device  30  to perform random access via either numerology, or different wireless devices  30  to perform random access via different numerologies, the wireless communication network  10  may monitor the PRACH transmissions in multiple numerologies, which increases the computation complexity on the network side. It is expected to achieve the random access performance gain of either low latency or robust enhancement of random access messages. 
     As another example, the numerology for random access is indicated by the SYNC sequence. There can be multiple SYNC sequences and these SYNC sequences are divided into two groups: a SYNC sequence from the first group indicates that the wireless device  30  can start random access via the numerology used by the detected sequence; otherwise, the wireless device  30  can use any numerology used by the SYNC sequence. 
     With this background, various embodiments of the disclosure are described below. 
       FIG. 4  illustrates an exemplary method  100  of random access implemented by a wireless device  30  in a mixed numerology wireless communication network  10  using mixed numerologies to support different services. The mixed numerology communication network  10  supports data transmissions to and from the wireless devices  30  over UL and/or downlink traffic channels, such as an Uplink Shared Channel (USCH) and/or and Downlink Shared Channel (DSCH). When the wireless device  30  is operating in a wireless communication network  10  supporting mixed numerologies for different services or devices, the wireless device  30  may not know the resources and/or numerology used by the RACH. In the method shown in  FIG. 4 , the wireless device  30  receives SI from a base station  20  or other network node in the wireless communication network (block  105 ). The SI contains configuration information indicating a configuration for random access. The configuration can include, for example, the numerology for random access. Based on the configuration information received in the SI, the wireless device  30  determines a numerology for random access (block  110 ). It will be appreciated that the wireless communication network  10  may employ a single numerology for the RACH even where multiple numerologies are supported for user traffic, or different numerologies on different RACHs. After determining a numerology for random access based on the configuration information, the wireless device  30  performs a random access on a sub-band configured according to the determined numerology to establish a connection with the base station  20  (block  115 ). For random access, the sub-band may simply be the carrier or frequency resources used for random access. 
     In some embodiments of method  100 , the wireless communication network  10  may use a single numerology for random access even where multiple numerologies are supported for transmissions over user traffic channels. In this case, the wireless device  30  may perform a random access on a first sub-band configured according to a pre-configured default numerology to establish a connection with the wireless device, and then switch to a second sub-band configured according to a second numerology for data transmissions on a traffic channel. The second sub-band may be selected based on the type of the wireless device, service type, or on predefined slice selection rules. 
     In some embodiments of method  100 , the wireless device  30  may determine a time advance during the random access on the first sub-band, and use the timing advance for the first sub-band for the data transmissions in the second sub-band. In other embodiments, the wireless device  30  may, after establishing a connection with the base station  20  or other network node in the first sub-band, obtain a timing advance from the second sub-band and use the timing advance for the second sub-band for data transmissions in the second sub-band. The timing advance may be acquired, for example, by transmitting a random access preamble in the second sub-band and receiving a random access response including the timing advance in the timing advance for the second sub-band. In another embodiment, the mobile device  30  may transmit a reference signal in the second sub-band and receive a response message responsive to the reference signal including the timing advance for the second sub-band. 
     In some embodiments of method  100 , the wireless communication network  10  may support RACHs using different numerologies. In this case, the configuration information transmitted as part of the SI may contain a listing of two or more available numerologies for random access. The wireless device  30  may select a sub-band configured according to one of the available numerologies and perform a random access in the selected sub-band. 
     In one exemplary embodiment of method  100 , the wireless device  30  generates, based on the configuration information, a mapping associating service types to corresponding numerologies. When the wireless device  30  needs to perform a random access, the wireless device  30  determines a service type for the connection with the base station  20  or other network node and selects a sub-band configured according to a numerology associated with the service type. The wireless device  30  then performs a random access on the selected sub-band. The mapping associating service types to corresponding numerologies may be stored in memory of the wireless device  30 . 
     In another embodiment of method  100 , the wireless device  30  may be configured to select a numerology and/or sub-band based on a distance to the base station  20  or other network node. In this embodiment, the wireless device  30  determines a distance to the base station  20  or other network node and selects an available numerology based on the distance. The wireless device  30  then selects a sub-band configured according to the selected numerology. 
     In other embodiments of method  100 , the wireless device  30  selects a sub-band and/or numerology based on a service type for the connection with the base station  20  or other network node and/or device type. In these embodiments, the wireless device  30  determines either a service type for a desired connection to the base station  20  or other network node, or a device type of the wireless device  30 . The wireless device  30  may select a numerology based on the service type for the connection with the base station  20  or other network node, the device type, or both. 
     In another embodiment of method  100 , the configuration information indicates a numerology for random access that is substantially the same as the numerology for data transmissions on an UL traffic channel, such as the shared UL channel. In this context, the numerologies are substantially the same if the same processing hardware in the base station  20  or other network node can be used to receive both the preamble transmitted by the wireless device  30  during the random access procedure and the user data transmissions on the UL traffic channel. In this case, the wireless device  30  performs the random access on a sub-band configured according to a numerology indicated in the system information to establish a connection to the base station  20  or other network node. 
       FIG. 5  illustrates exemplary method  120  of random access according to another embodiment implemented by a wireless device  30  in a mixed numerology wireless communication network  10  supporting mixed numerologies to support different services. In the method shown in  FIG. 5 , the wireless device  30  receives SI from a base station  20  or other network node in the wireless communication network (block  125 ). The SI contains configuration information indicating a configuration for random access. Based on the configuration information received in the SI, the wireless device  30  determines a first numerology for random access (block  130 ). The method  120  further comprises performing random access on a first sub-band configured according to the indicated first numerology to establish a connection with the base station  20  (block  135 ). After establishing the connection with the network node, the wireless device  30  switches to a second sub-band configured according to a second numerology for data transmission on a shared UL channel (block  140 ). In one embodiment, the first and second sub-bands may comprise the carrier or frequency resources used for random access and data transmission, respectively. 
     In other embodiments of method  120 , the wireless device  30  selects a sub-band and/or numerology based on a service type for the connection with the base station  20  or other network node and/or device type. In these embodiments, the wireless device  30  determines either a service type for a desired connection to the base station  20  or other network node, or a device type of the wireless device  30 . The wireless device  30  may select a numerology based on the service type for the connection with the base station  20  or other network node, the device type, or both. 
     In other embodiments of method  120 , the wireless device  30  selects a sub-band and/or numerology based on pre-defined slice selection rules. 
     Some embodiments of the method  120  further comprise deriving a power adjustment for the data transmissions on the second sub-band based on an accumulated power adjustment on the first sub-band. 
     In some embodiments of method  120 , the wireless device  30  may obtain a time advance during the random access on the first sub-band, and use the timing advance for the first sub-band for the data transmissions in the second sub-band. In other embodiments, the wireless device  30  may, after establishing a connection with the base station  20  or other network node in the first sub-band, obtain a timing advance from the second sub-band and use the timing advance for the second sub-band for data transmissions in the second sub-band. The timing advance may be acquired, for example, by transmitting a random access preamble in the second sub-band and receiving a random access response including the timing advance in the timing advance for the second sub-band. In another embodiment, the mobile device  30  may transmit a reference signal in the second sub-band and receive a response message responsive to the reference signal including the timing advance for the second sub-band. 
     In one exemplary embodiment of method  120 , the wireless device  30  generates, based on the configuration information, a mapping associating service types to corresponding numerologies. When the wireless device  30  needs to perform a random access, the wireless device  30  determines a service type for the connection with the base station  20  or other network node and then determines the first numerology based on the service type. The mapping associating service types to corresponding numerologies may be stored in memory of the wireless device  30 . 
     In some embodiments of method  120 , the wireless communication network  10  may support RACHs using different numerologies. In this case, the configuration information transmitted as part of the SI may contain a listing of two or more available numerologies for random access. In this case, the wireless device  30  selects a sub-band configured according to one of the available numerologies and performs a random access in the selected sub-band. 
     In another embodiment of method  120 , the wireless device  30  may be configured to select the first numerology and/or sub-band based on a distance to the base station  20  or other network node. In this embodiment, the wireless device  30  determines a distance to the base station  20  or other network node and selects an available numerology based on the distance as the first numerology. 
     In another embodiment of method  120 , the wireless device  30  may be configured to select the first numerology and/or sub-band based on a service type for the connection to the base station or network node. In this embodiment, the wireless device  30  determines a service type for the connection to the base station or network node and selects an available numerology based on the service type as the first numerology. 
     In another embodiment of method  120 , the wireless device  30  may be configured to select the first numerology and/or sub-band based on a device type of the wireless device. In this embodiment, the wireless device  30  determines a device type of the wireless device and selects an available numerology based on the device type as the first numerology. 
     In another embodiment of method  120 , the configuration information indicates a numerology for random access that is substantially the same as the numerology for data transmissions on an UL traffic channel, such as the shared UL channel. In this context, the numerologies are substantially the same if the same processing hardware in the base station  20  or other network node can be used to receive both the preamble transmitted by the wireless device  30  during the random access procedure and the user data transmissions on the UL traffic channel. In this case, the wireless device  30  performs the random access on a sub-band configured according to a numerology indicated in the SI to establish a connection to the base station  20  or other network node. 
       FIG. 6  illustrates exemplary method  150  of random access according to another embodiment implemented by a wireless device  30  in a mixed numerology wireless communication network  10  supporting mixed numerologies to support different services. In this embodiment, the wireless device  30  receives SI from a base station  20  or other network node in the wireless communication network (block  155 ). The SI contains configuration information indicating a numerology for random access. The wireless device performs a random access on a sub-band configured according to the indicated numerology to establish a connection with the base station  20  (block  160 ). The indicated numerology enables the base station  20  or other network node to process a random access preamble and subsequent transmission on a shared UL channel using common processing hardware. In some embodiments, the method  140  further comprises transmitting user data to the base station  20  or other network node on the shared UL channel (block  165 ). 
     Some embodiments of method  150  further comprise, after performing a random access, switching to a second sub-band configured according to a different numerology for data transmissions, such as data transmissions on an UL shared channel. In some embodiments, the second sub-band/numerology can be selected based on one or more of a device type, service type, and/or distance of the wireless device from the base station or network node. In other embodiments, the second sub-band/numerology could be selected based on a configuration received from the network. 
     In some embodiments of the method  150 , the wireless device  30  may obtain a time advance during the random access on the first sub-band, and use the timing advance for the first sub-band for the data transmissions in the second sub-band. In other embodiments, the wireless device  30  may, after establishing a connection with the base station  20  or other network node in the first sub-band, obtain a timing advance from the second sub-band and use the timing advance for the second sub-band for data transmissions in the second sub-band. The timing advance may be acquired, for example, by transmitting a random access preamble in the second sub-band and receiving a random access response including the timing advance in the timing advance for the second sub-band. In another embodiment, the mobile device  30  may transmit a reference signal in the second sub-band and receive a response message responsive to the reference signal including the timing advance for the second sub-band. 
       FIG. 7  illustrates exemplary method  200  of random access according to another embodiment implemented by a wireless device  30  in a mixed numerology wireless communication network  10  supporting mixed numerologies to support different services. In this embodiment, the wireless device  30  receives SI from a base station  20  or other network node in the wireless communication network (block  210 ). The SI contains configuration information indicating a configuration for random access. Based on the configuration information received in the SI, the wireless device  30  determines a default numerology for random access (block  220 ). The method  200  further comprises performing random access on a first sub-band configured according to the indicated numerology to establish a connection with the base station  20  other network node (block  230 ). After establishing the connection with the network node, the wireless device  30  switches to a second sub-band configured according to a second numerology for data transmissions (block  240 ). 
     In some embodiments of method  200 , the second sub-band numerology may be determined based on one or more of a device type, service type, and/or distance of the wireless device from the base station or network node. 
     In some embodiments of the method  200 , the wireless device  30  may obtain a time advance during the random access on the first sub-band, and use the timing advance for the first sub-band for the data transmissions in the second sub-band. In other embodiments, the wireless device  30  may, after establishing a connection with the base station  20  or other network node in the first sub-band, obtain a timing advance from the second sub-band and use the timing advance for the second sub-band for data transmissions in the second sub-band. The timing advance may be acquired, for example, by transmitting a random access preamble in the second sub-band and receiving a random access response including the timing advance in the timing advance for the second sub-band. In another embodiment, the mobile device  30  may transmit a reference signal in the second sub-band and receive a response message responsive to the reference signal including the timing advance for the second sub-band. 
       FIG. 8  illustrates exemplary method  250  of random access according to another embodiment implemented by a wireless device  30  in a mixed numerology wireless communication network  10  supporting mixed numerologies to support different services. In this embodiment, the wireless device  30  receives SI from a base station  20  or other network node in the wireless communication network (block  260 ). The SI contains configuration information indicating two or more available numerologies for random access. Based on the configuration information received in the SI, the wireless device  30  selects one of the available numerologies for random access (block  270 ). The method  250  further comprises performing random access on a PRACH configured according to the indicated numerology to establish a connection with the base station  20  (block  280 ). 
     In some embodiments of method  250 , the numerology for random access is selected based on one or more of a device type, service type, and/or distance of the wireless device from the base station or network node. 
     Some embodiments of method  250  further comprise, after performing a random access, switches to a sub-band configured according to a different numerology for data transmissions, such as data transmissions on an UL shared channel. The sub-band for data transmission can be selected based on one or more of a device type, service type, and/or distance of the wireless device from the base station or network node. 
     In some embodiments of the method  250 , the wireless device  30  may obtain a time advance during the random access, and use the timing advance for the data transmissions in the sub-band selected for data transmission. In other embodiments, the wireless device  30  may, after establishing a connection with the base station  20  or other network node, obtain a timing advance from the sub-band selected for data transmissions in the second sub-band. The timing advance may be acquired, for example, by transmitting a random access preamble in the sub-band and receiving a random access response including the timing advance in the timing advance for the second sub-band. In another embodiment, the mobile device  30  may transmit a reference signal in the sub-band and receive a response message responsive to the reference signal including the timing advance for the sub-band. 
       FIG. 9  illustrates the main functional components of a wireless device  300 , configured for use in a mixed numerology wireless communication network  10 . The wireless device  300  can be configured to perform one or more of the methods shown in  FIGS. 4-8 . The wireless device  300  comprises a processing circuit  310 , an interface circuit  340 , and memory  350 . 
     The interface circuit  340  is coupled to one or more antennas (not shown) and comprises the Radio Frequency (RF) components needed for communicating with the base station  20  over a wireless communication channel. Typically, the RF components include a transmitter and receiver adapted for communications according to the NR standards or other Radio Access Technology (RAT). 
     The processing circuit  310  processes the signals transmitted to or received by the wireless device  300 . Such processing includes coding and modulation of transmitted signals, and the demodulation and decoding of received signals. The processing circuit  310  includes a system information unit  315  for receiving and processing the SI and other configuration information transmitted by the base station  20 , a configuration unit  320  to configure random access procedures for the wireless device  30 , and a random access unit  325  to perform random access procedures. In some embodiments, processing circuit  310  of the wireless device  300  further comprises a transmitting unit  330  for transmitting data. As one example, the transmitting unit  330  may be configured to transmit data on an UL shared channel. The processing circuit  310  may comprise one or more microprocessors, hardware, firmware, or a combination thereof. In one embodiment, the system information unit  315  and random access unit  325  are implemented by a single microprocessor. In other embodiments, the system information unit  315  and random access unit  325  are implemented using different microprocessors. 
     Memory  350  comprises both volatile and non-volatile memory for storing computer program code and data needed by the processing circuit  310  for operation. Memory  350  may comprise any tangible, non-transitory computer-readable storage medium for storing data including electronic, magnetic, optical, electromagnetic, or semiconductor data storage. Memory  350  stores a computer program  360  comprising executable instructions that configure the processing circuit  310  to implement methods according to  FIGS. 4-8  as described herein. In general, computer program instructions and configuration information are stored in a non-volatile memory, such as a Read Only Memory (ROM), Erasable Programmable Read Only Memory (EPROM) or flash memory. Temporary data generated during operation may be stored in a volatile memory, such as a Random Access Memory (RAM). In some embodiments, computer program  360  for configuring the processing circuit  310  as herein described may be stored in a removable memory, such as a portable compact disc, portable digital video disc, or other removable media. The computer program  360  may also be embodied in a carrier such as an electronic signal, optical signal, radio signal, or computer readable storage medium. 
       FIG. 10  illustrates another random access method  400  for a wireless communication network  10  that supports multiple numerologies that are used for different service types. A wireless device  30  that needs to perform a random access to connect to the base station  20  or other network node detects one or more synchronization signals transmitted by the base station  20  or other network node (block  410 ). The wireless device  30  determines one or more available numerologies from the detected synchronization signals (block  420 ) and performs a random access on a sub-band configured according to one of said available numerologies to establish a connection with the base station  20  or other network node (block  430 ). In one embodiment, the sub-band comprises the carrier frequency or frequency resources used for random access. 
     In some embodiments of the method  400 , the wireless device  30  determines the numerologies of the detected synchronization signals and considers the numerologies of the detected synchronization signals to be the available numerologies for random access. 
     In other embodiments of the method  400 , the wireless device  30  determines the numerologies for the detected synchronization signals and then determines the numerologies for the RACHs from the numerologies of the detected synchronization signals based on a pre-determined rule. 
     However the available numerologies are determined, the wireless device  30  may, in some embodiments of the method  400 , select one of the available numerologies based on a service type for the desired connection and/or device type of the wireless device  30 . In these embodiments, the wireless device  30  determines a service type for the connection with a base station  20  or other network node or a device type of the wireless device. The wireless device  30  selects a sub-band configured according to one of the available numerologies based on the service type, device type, or both, and performs a random access on the selected sub-band. 
       FIG. 11  illustrates a wireless device  500  according to another embodiment. The wireless device  500  comprises a processing circuit  510 , an interface circuit  540 , and memory  550 . 
     The interface circuit  540  is coupled to one or more antennas (not shown) and comprises the RF components needed for communicating with the base station  20  over a wireless communication channel. Typically, the RF components include a transmitter and receiver adapted for communications according to the NR standards or other RAT. 
     The processing circuit  510  processes the signals transmitted to or received by the wireless device  500 . Such processing includes coding and modulation of transmitted signals, and the demodulation and decoding of received signals. The processing circuit  510  includes a synchronization unit  515  for receiving and processing synchronization signals transmitted by the base station  20 , a configuration unit  520  to configure random access procedures for the wireless device  500 , and a random access unit  525  to perform random access procedures. In some embodiments, processing circuit  510  of the wireless device  500  further comprises a transmitting unit  530  for transmitting data. As one example, the transmitting (TX) unit  530  may be configured to transmit data on an UL shared channel. The processing circuit  510  may comprise one or more microprocessors, hardware, firmware, or a combination thereof. In one embodiment, the synchronization unit  515  and random access unit  525  are implemented by a single microprocessor. In other embodiments, the synchronization unit  515  and random access unit  525  are implemented using different microprocessors. 
     Memory  550  comprises both volatile and non-volatile memory for storing computer program code and data needed by the processing circuit  510  for operation. Memory  550  may comprise any tangible, non-transitory computer-readable storage medium for storing data including electronic, magnetic, optical, electromagnetic, or semiconductor data storage. Memory  550  stores a computer program  555  comprising executable instructions that configure the processing circuit  510  to implement methods  400  according to  FIG. 10  as described herein. In general, computer program instructions and configuration information are stored in a non-volatile memory, such as a ROM, EPROM or flash memory. Temporary data generated during operation may be stored in a volatile memory, such as a RAM. In some embodiments, computer program  555  for configuring the processing circuit  510  as herein described may be stored in a removable memory, such as a portable compact disc, portable digital video disc, or other removable media. The computer program  555  may also be embodied in a carrier such as an electronic signal, optical signal, radio signal, or computer readable storage medium. 
       FIG. 12  illustrates an exemplary random access method  600  implemented by a base station  20  or other network node in the wireless communication network  10  supporting mixed numerologies for different service types. The base station  20  or other network node transmits SI to wireless devices  30  in an area served by the base station  20  or other network node (block  610 ). The SI contains configuration information for random access enabling the wireless devices  30  in the service area of the base station  20  to determine at least one available numerology for random access. The base station  20  or other network node monitors a random access channel in one or more sub-bands configured according to the available numerology or numerologies (block  620 ). In one embodiment, the sub-band comprises the carrier or frequency resources used for random access. 
     In some embodiments, the configuration information indicates two or more available numerologies for random access and the base station  20  or other network node monitors random access channels in sub-bands configured according to two or more available numerologies. In one embodiment, the configuration information indicates an available numerology for random access that is the same as or substantially similar to a numerology used by the base station  20  or other network node to receive data transmissions on an UL traffic channel. In this embodiment, the method  600  further comprises receiving a preamble transmitted by a wireless device  30  using the processing hardware adapted to receive data transmissions from the wireless device  30  on the UL traffic channel. 
       FIG. 13  illustrates an exemplary random access method  630  according to another embodiment implemented by a base station  20  or other network node in the wireless communication network  10  supporting mixed numerologies for different service types. The base station  20  or other network node transmits SI to wireless devices  30  in an area served by the base station  20  or other network node (block  640 ). The SI contains configuration information for random access enabling the wireless devices  30  in the service area of the base station  20  to determine a first numerology for random access. The base station  20  or other network node monitors a random access channel configured according to the first numerology (block  650 ). The method  630  further comprises receiving, by the base station  20  or other network node, a random access preamble from the wireless device  30  on a first sub-band configured according to the first numerology (block  660 ). The base station  20  or other network node subsequently receives an UL transmission from the wireless device  30  on a shared UL channel in a second sub-band configured according to a second numerology different from the first numerology (block  670 ). In one embodiment, the first and second sub-bands may comprise the carrier or frequency resources used for random access and UL shard channel, respectively. 
       FIG. 14  illustrates an exemplary random access method  700  according to another embodiment implemented by a base station  20  or other network node in the wireless communication network  10  supporting mixed numerologies for different service types. The base station  20  or other network node transmits SI to wireless devices  30  in an area served by the base station  20  or other network node (block  710 ). The SI contains configuration information including two or more available numerologies for random access. The base station  20  or other network node monitors random access channels in sub-bands configured according the available numerologies (block  720 ). The method further comprises receiving, by the base station  20  or other network node, a random access preamble from the wireless device on a sub-band configured according to one of the available numerologies (block  730 ). 
       FIG. 15  illustrates an exemplary random access method  750  according to another embodiment implemented by a base station  20  or other network node in the wireless communication network  10  supporting mixed numerologies for different service types. The base station  20  or other network node transmits SI to wireless devices  30  in an area served by the base station  20  or other network node (block  760 ). The SI contains configuration information indicating a numerology for random access. The base station  20  or other network node monitors a random access channel configured according to the indicated numerology (block  770 ). In some embodiments, the base station  20  subsequently receives a preamble transmitted on the random access channel using processing hardware adapted to receive data transmissions from the wireless device on a shared UL channel (block  780 ). 
       FIG. 16  illustrates the main functional components of a network node  800 , such as a base station, configured for use in a mixed numerology wireless communication network  10 . The network node  800  comprises a processing circuit  810 , an interface circuit  830 , and memory  840 . 
     The interface circuit  830  is coupled to one or more antennas (not shown) and comprises the RF components needed for communicating with the wireless devices  30  over a wireless communication channel. Typically, the RF components include a transmitter and receiver adapted for communications according to the NR standards or other RAT. 
     The processing circuit  810  processes the signals transmitted to or received by the network node  800 . Such processing includes coding and modulation of transmitted signals, and the demodulation and decoding of received signals. The processing circuit  810  includes a SI unit  815  for generating and transmitting the SI and other configuration information to wireless devices  30  in the area served by the base station  800 , and a random access unit  820  to monitor the random access channels and perform random access procedures. In some embodiments, the processing circuit  810  further comprises a receiving (RX) unit  825  for receiving transmissions from the wireless device in the PRACH and/or USCH. The processing circuit  810  may comprise one or more microprocessors, hardware, firmware, or a combination thereof. In one embodiment, the SI unit  815 , random access unit  820  and RX unit  825  are implemented by a single microprocessor. In other embodiments, the SI unit  815  and random access unit  820  are implemented using different microprocessors. 
     Memory  840  comprises both volatile and non-volatile memory for storing computer program code and data needed by the processing circuit  810  for operation. Memory  840  may comprise any tangible, non-transitory computer-readable storage medium for storing data including electronic, magnetic, optical, electromagnetic, or semiconductor data storage. Memory  840  stores a computer program  850  comprising executable instructions that configure the processing circuit  810  to implement methods according to  FIGS. 12-15 . In general, computer program instructions and configuration information are stored in a non-volatile memory, such as a ROM, EPROM or flash memory. Temporary data generated during operation may be stored in a volatile memory, such as a RAM. In some embodiments, computer program  850  for configuring the processing circuit  810  as herein described may be stored in a removable memory, such as a portable compact disc, portable digital video disc, or other removable media. The computer program ( 850 ) may also be embodied in a carrier such as an electronic signal, optical signal, radio signal, or computer readable storage medium. 
       FIG. 17  illustrates an exemplary random access method  900  implemented by a base station  20  or other network node in the wireless communication network  10  supporting mixed numerologies for different service types. The base station  20  or other network node transmits one or more synchronization signals to wireless devices  30  in an area served by the base station  20  or other network node (block  910 ). The synchronization signals implicitly indicate the available numerology or numerologies used for random access to the wireless devices  30  in the service area of the base station  20 . The base station  20  or other network node monitors a random access channel in one or more sub-bands configured according to the available numerology or numerologies (block  920 ). In some embodiments, the configuration information indicates two or more available numerologies for random access and the base station  20  or other network node monitors random access channels in sub-bands configured according to two or more available numerologies. 
     In one embodiment, the configuration information indicates an available numerology for random access that is the same as or substantially similar to a numerology used by the base station  20  or other network node to receive data transmissions on an UL traffic channel. In this embodiment, the method  900  further comprises receiving a preamble transmitted by a wireless device  30  using the processing hardware adapted to receive data transmissions from the wireless device  30  on the UL traffic channel. 
       FIG. 18  illustrates the main functional components of a network node  1000 , such as a base station  20 , configured for use in a mixed numerology wireless communication network  10 . The network node  1000  comprises a processing circuit  1010 , an interface circuit  1030 , and memory  1040 . 
     The interface circuit  1030  is coupled to one or more antennas (not shown) and comprises the RF components needed for communicating with the wireless devices  30  over a wireless communication channel. Typically, the RF components include a transmitter and receiver adapted for communications according to the NR standards or other RAT. 
     The processing circuit  1010  processes the signals transmitted to or received by the network node  1000 . Such processing includes coding and modulation of transmitted signals, and the demodulation and decoding of received signals. The processing circuit  1010  includes a synchronization unit  1015  for generating and transmitting synchronization signals to wireless devices  30  in the area served by the base station  1000 , and a random access unit  1020  to monitor the random access channels and perform random access procedures. In some embodiments, the processing circuit  1010  further comprises a receiving (RX) unit  1025  for receiving transmissions from the wireless device in the PRACH and/or USCH. The processing circuit  1010  may comprise one or more microprocessors, hardware, firmware, or a combination thereof. In one embodiment, the synchronization unit  1015 , random access unit  1020  and RX unit  1025  are implemented by a single microprocessor. In other embodiments, the synchronization unit  1015  and random access unit  1020  are implemented using different microprocessors. 
     Memory  1040  comprises both volatile and non-volatile memory for storing computer program code and data needed by the processing circuit  1010  for operation. Memory  1040  may comprise any tangible, non-transitory computer-readable storage medium for storing data including electronic, magnetic, optical, electromagnetic, or semiconductor data storage. Memory  1040  stores a computer program  1050  comprising executable instructions that configure the processing circuit  1010  to implement methods  900  according to  FIG. 17 . In general, computer program instructions and configuration information are stored in a non-volatile memory, such as a ROM, EPROM or flash memory. Temporary data generated during operation may be stored in a volatile memory, such as a RAM. In some embodiments, computer program  1050  for configuring the processing circuit  1010  as herein described may be stored in a removable memory, such as a portable compact disc, portable digital video disc, or other removable media. The computer program ( 1050 ) may also be embodied in a carrier such as an electronic signal, optical signal, radio signal, or computer readable storage medium. 
       FIG. 19  illustrates a wireless device  1100  according to another embodiment configured to perform the methods of  FIGS. 4-8  as herein described. The wireless device  1110  includes a system information module  1110 , a configuration module  1120 , and a random access module  1130 . The system information module  1110  is configured to receive and process the SI and other configuration information transmitted by the base station or other network node. The SI may comprise configuration information indicating a configuration for random access, and/or configuration information indicating one or more available numerologies. The configuration module  1120  is adapted to determine a sub-band and configure random access procedures for the wireless device  1100  based on the configuration information as herein described. The random access module  1120  is configured to determine a sub-band/numerology for random access and perform random access procedures as herein described. Some embodiments may further include a transmitting (TX) module  1130  for transmitting data. As one example, the TX module  1130  may be configured to transmit data on a PRACH and/or an UL shared channel. The various modules  1110 ,  1120 , and  1130  can be implemented by hardware and/or by software code that is executed by a processor or processing circuit. 
       FIG. 20  illustrates a wireless device  1150  according to another embodiment configured to perform the method of  FIG. 10  as herein described. The wireless device  1150  includes a synchronization module  1160 , and a random access module  1170 . The synchronization module  1160  is configured to receive and process the synchronization signals transmitted by a base station or network node. The random access module  1170  is configured to determine a sub-band/numerology for random access and perform random access procedures as herein described. Some embodiments may further include a transmitting (TX) module  1180  for transmitting data. As one example, the TX module  1180  may be configured to transmit data on a PRACH and/or an UL shared channel. The various modules  1160 ,  1170 , and  1180  can be implemented by hardware and/or by software code that is executed by a processor or processing circuit. 
       FIG. 21  illustrates a network node (e.g., base station)  1200  according to another embodiment configured to perform the methods of  FIGS. 12-15  as herein described. The network node  1200  includes a system information (SI) module  1210  and a random access module  1220 . The system information (SI) module  1210  is configured to generate and transmit the SI and other configuration information to wireless devices in the area served by the network node  1200 . The random access module  1220  is configured to monitor the random access channels and perform random access procedures. In some embodiments, the network node  1200  further comprises a receiving (RX) module  1230  for receiving transmissions from the wireless device in the PRACH and/or USCH. The various modules  1210 ,  1220 , and  1230  can be implemented by hardware and/or by software code that is executed by a processor or processing circuit. 
       FIG. 22  illustrates a network node (e.g., base station)  1250  according to another embodiment perform the methods of  FIG. 17  as herein described. The network node  1250  includes a synchronization module  1260  and a random access module  1270 . The synchronization module  1260  is configured to generate the synchronization signals and transmit the synchronization signal to wireless devices in an area served by the network node  1250 . The random access module  1270  is configured to monitor the random access channels and perform random access procedures. In some embodiments, the network node  1250  further comprises a receiving (RX) module  1280  for receiving transmissions from the wireless device in the PRACH and/or USCH. The various modules  1260 ,  1270 , and  1280  can be implemented by hardware and/or by software code that is executed by a processor or processing circuit.